diff --git a/rest/nodejs/package-lock.json b/rest/nodejs/package-lock.json
index e00bb021..c433defa 100644
--- a/rest/nodejs/package-lock.json
+++ b/rest/nodejs/package-lock.json
@@ -8,37 +8,23 @@
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-      "license": "MIT",
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-        "@cspotcode/source-map-support": "^0.8.0",
-        "@tsconfig/node10": "^1.0.7",
-        "@tsconfig/node12": "^1.0.7",
-        "@tsconfig/node14": "^1.0.0",
-        "@tsconfig/node16": "^1.0.2",
-        "acorn": "^8.4.1",
-        "acorn-walk": "^8.1.1",
-        "arg": "^4.1.0",
-        "create-require": "^1.1.0",
-        "diff": "^4.0.1",
-        "make-error": "^1.1.1",
-        "v8-compile-cache-lib": "^3.0.1",
-        "yn": "3.1.1"
-      },
-      "bin": {
-        "ts-node": "dist/bin.js",
-        "ts-node-cwd": "dist/bin-cwd.js",
-        "ts-node-esm": "dist/bin-esm.js",
-        "ts-node-script": "dist/bin-script.js",
-        "ts-node-transpile-only": "dist/bin-transpile.js",
-        "ts-script": "dist/bin-script-deprecated.js"
-      },
-      "peerDependencies": {
-        "@swc/core": ">=1.2.50",
-        "@swc/wasm": ">=1.2.50",
-        "@types/node": "*",
-        "typescript": ">=2.7"
-      },
-      "peerDependenciesMeta": {
-        "@swc/core": {
-          "optional": true
-        },
-        "@swc/wasm": {
-          "optional": true
-        }
-      }
-    },
     "node_modules/tsx": {
       "version": "4.22.4",
       "resolved": "https://registry.npmjs.org/tsx/-/tsx-4.22.4.tgz",
@@ -2605,16 +1520,6 @@
         "node": ">=14.17"
       }
     },
-    "node_modules/typical": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/typical/-/typical-4.0.0.tgz",
-      "integrity": "sha512-VAH4IvQ7BDFYglMd7BPRDfLgxZZX4O4TFcRDA6EN5X7erNJJq+McIEp8np9aVtxrCJ6qx4GTYVfOWNjcqwZgRw==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=8"
-      }
-    },
     "node_modules/undici-types": {
       "version": "6.21.0",
       "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-6.21.0.tgz",
@@ -2622,42 +1527,6 @@
       "dev": true,
       "license": "MIT"
     },
-    "node_modules/unicode-properties": {
-      "version": "1.4.1",
-      "resolved": "https://registry.npmjs.org/unicode-properties/-/unicode-properties-1.4.1.tgz",
-      "integrity": "sha512-CLjCCLQ6UuMxWnbIylkisbRj31qxHPAurvena/0iwSVbQ2G1VY5/HjV0IRabOEbDHlzZlRdCrD4NhB0JtU40Pg==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "base64-js": "^1.3.0",
-        "unicode-trie": "^2.0.0"
-      }
-    },
-    "node_modules/unicode-trie": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/unicode-trie/-/unicode-trie-2.0.0.tgz",
-      "integrity": "sha512-x7bc76x0bm4prf1VLg79uhAzKw8DVboClSN5VxJuQ+LKDOVEW9CdH+VY7SP+vX7xCYQqzzgQpFqz15zeLvAtZQ==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "pako": "^0.2.5",
-        "tiny-inflate": "^1.0.0"
-      }
-    },
-    "node_modules/unicode-trie/node_modules/pako": {
-      "version": "0.2.9",
-      "resolved": "https://registry.npmjs.org/pako/-/pako-0.2.9.tgz",
-      "integrity": "sha512-NUcwaKxUxWrZLpDG+z/xZaCgQITkA/Dv4V/T6bw7VON6l1Xz/VnrBqrYjZQ12TamKHzITTfOEIYUj48y2KXImA==",
-      "dev": true,
-      "license": "MIT"
-    },
-    "node_modules/urijs": {
-      "version": "1.19.11",
-      "resolved": "https://registry.npmjs.org/urijs/-/urijs-1.19.11.tgz",
-      "integrity": "sha512-HXgFDgDommxn5/bIv0cnQZsPhHDA90NPHD6+c/v21U5+Sx5hoP8+dP9IZXBU1gIfvdRfhG8cel9QNPeionfcCQ==",
-      "dev": true,
-      "license": "MIT"
-    },
     "node_modules/util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
@@ -2677,177 +1546,16 @@
         "uuid": "dist-node/bin/uuid"
       }
     },
-    "node_modules/v8-compile-cache-lib": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/v8-compile-cache-lib/-/v8-compile-cache-lib-3.0.1.tgz",
-      "integrity": "sha512-wa7YjyUGfNZngI/vtK0UHAN+lgDCxBPCylVXGp0zu59Fz5aiGtNXaq3DhIov063MorB+VfufLh3JlF2KdTK3xg==",
-      "dev": true,
-      "license": "MIT"
-    },
-    "node_modules/webidl-conversions": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-3.0.1.tgz",
-      "integrity": "sha512-2JAn3z8AR6rjK8Sm8orRC0h/bcl/DqL7tRPdGZ4I1CjdF+EaMLmYxBHyXuKL849eucPFhvBoxMsflfOb8kxaeQ==",
-      "dev": true,
-      "license": "BSD-2-Clause"
-    },
-    "node_modules/whatwg-url": {
-      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-5.0.0.tgz",
-      "integrity": "sha512-saE57nupxk6v3HY35+jzBwYa0rKSy0XR8JSxZPwgLr7ys0IBzhGviA1/TUGJLmSVqs8pb9AnvICXEuOHLprYTw==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "tr46": "~0.0.3",
-        "webidl-conversions": "^3.0.0"
-      }
-    },
-    "node_modules/wordwrap": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
-      "integrity": "sha512-gvVzJFlPycKc5dZN4yPkP8w7Dc37BtP1yczEneOb4uq34pXZcvrtRTmWV8W+Ume+XCxKgbjM+nevkyFPMybd4Q==",
-      "dev": true,
-      "license": "MIT"
-    },
-    "node_modules/wordwrapjs": {
-      "version": "5.1.1",
-      "resolved": "https://registry.npmjs.org/wordwrapjs/-/wordwrapjs-5.1.1.tgz",
-      "integrity": "sha512-0yweIbkINJodk27gX9LBGMzyQdBDan3s/dEAiwBOj+Mf0PPyWL6/rikalkv8EeD0E8jm4o5RXEOrFTP3NXbhJg==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=12.17"
-      }
-    },
-    "node_modules/wrap-ansi": {
-      "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz",
-      "integrity": "sha512-YVGIj2kamLSTxw6NsZjoBxfSwsn0ycdesmc4p+Q21c5zPuZ1pl+NfxVdxPtdHvmNVOQ6XSYG4AUtyt/Fi7D16Q==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "ansi-styles": "^4.0.0",
-        "string-width": "^4.1.0",
-        "strip-ansi": "^6.0.0"
-      },
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-      "funding": {
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-      }
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-    "node_modules/wrap-ansi/node_modules/ansi-styles": {
-      "version": "4.3.0",
-      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
-      "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
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-      },
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-      },
-      "funding": {
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-      }
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-    "node_modules/wrap-ansi/node_modules/color-convert": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
-      "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
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-      },
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-      }
-    },
-    "node_modules/wrap-ansi/node_modules/color-name": {
-      "version": "1.1.4",
-      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
-      "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
-      "dev": true,
-      "license": "MIT"
-    },
     "node_modules/wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
       "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
       "license": "ISC"
     },
-    "node_modules/y18n": {
-      "version": "5.0.8",
-      "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",
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-      "integrity": "sha512-mplynKqc1C2hTVYxd0PU2xQAc22TI1vShAYGksCCfxbn/dFwnHTNi1bvYsBTkhdUNtGIf5xNOg938rrSSYvS9A==",
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-      "license": "ISC",
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-        "yaml": "bin.mjs"
-      },
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-        "node": ">= 14.6"
-      },
-      "funding": {
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-    "node_modules/yargs": {
-      "version": "17.7.2",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-17.7.2.tgz",
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-      "dependencies": {
-        "cliui": "^8.0.1",
-        "escalade": "^3.1.1",
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-        "require-directory": "^2.1.1",
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-      "dev": true,
-      "license": "ISC",
-      "engines": {
-        "node": ">=12"
-      }
-    },
-    "node_modules/yn": {
-      "version": "3.1.1",
-      "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz",
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-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=6"
-      }
-    },
     "node_modules/zod": {
-      "version": "4.2.1",
-      "resolved": "https://registry.npmjs.org/zod/-/zod-4.2.1.tgz",
-      "integrity": "sha512-0wZ1IRqGGhMP76gLqz8EyfBXKk0J2qo2+H3fi4mcUP/KtTocoX08nmIAHl1Z2kJIZbZee8KOpBCSNPRgauucjw==",
+      "version": "3.25.76",
+      "resolved": "https://registry.npmjs.org/zod/-/zod-3.25.76.tgz",
+      "integrity": "sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ==",
       "license": "MIT",
       "funding": {
         "url": "https://github.com/sponsors/colinhacks"
diff --git a/rest/nodejs/package.json b/rest/nodejs/package.json
index e49df6c8..1073f4ba 100644
--- a/rest/nodejs/package.json
+++ b/rest/nodejs/package.json
@@ -5,26 +5,24 @@
     "dev": "tsx watch src/index.ts",
     "build": "tsc",
     "test": "tsx --test test/*.test.ts",
-    "start": "node dist/index.js",
-    "generate:models": "bash scripts/generate_models.sh"
+    "start": "node dist/index.js"
   },
   "dependencies": {
     "@hono/node-server": "^1.19.13",
     "@hono/zod-validator": "^0.7.6",
+    "@ucp-js/sdk": "0.4.1",
     "better-sqlite3": "^9.4.3",
     "hono": "^4.12.25",
     "pino": "^10.1.0",
     "pino-http": "^11.0.0",
     "pino-http-print": "^4.0.0",
     "uuid": "^14.0.0",
-    "zod": "^4.2.1"
+    "zod": "^3.23.8"
   },
   "devDependencies": {
     "@types/better-sqlite3": "^7.6.9",
     "@types/node": "^20.11.17",
     "@types/uuid": "^9.0.8",
-    "json-schema-to-zod": "^2.6.0",
-    "quicktype": "^23.2.6",
     "tsx": "^4.22.4",
     "typescript": "^5.8.3"
   }
diff --git a/rest/nodejs/scripts/generate_models.sh b/rest/nodejs/scripts/generate_models.sh
deleted file mode 100755
index ad13d536..00000000
--- a/rest/nodejs/scripts/generate_models.sh
+++ /dev/null
@@ -1,15 +0,0 @@
-#!/bin/bash
-quicktype \
-  --lang typescript-zod \
-  --src-lang schema \
-  --src ../../../spec/discovery/*.json \
-  --src ../../../spec/schemas/shopping/*.json \
-  --src ../../../spec/schemas/shopping/types/*.json \
-  --src '../../../spec/schemas/shopping/ap2_mandate.json#/$defs/complete_request_with_ap2' \
-  --src '../../../spec/schemas/shopping/ap2_mandate.json#/$defs/checkout_response_with_ap2' \
-  --src '../../../spec/schemas/shopping/buyer_consent.json#/$defs/checkout' \
-  --src '../../../spec/schemas/shopping/discount.json#/$defs/checkout' \
-  --src '../../../spec/schemas/shopping/fulfillment.create_req.json#/$defs/checkout' \
-  --src '../../../spec/schemas/shopping/fulfillment.update_req.json#/$defs/checkout' \
-  --src '../../../spec/schemas/shopping/fulfillment_resp.json#/$defs/checkout' \
-  -o src/models/spec_generated.ts
diff --git a/rest/nodejs/src/api/checkout.ts b/rest/nodejs/src/api/checkout.ts
index d21a225d..b042a184 100644
--- a/rest/nodejs/src/api/checkout.ts
+++ b/rest/nodejs/src/api/checkout.ts
@@ -2,6 +2,7 @@ import { createHash } from "crypto";
 import { type Context } from "hono";
 import { v4 as uuidv4 } from "uuid";
 import { z } from "zod";
+import { UCP_VERSION } from "../utils/config";
 
 import {
   getCheckoutSession,
@@ -18,6 +19,7 @@ import {
 } from "../data";
 import {
   CheckoutResponseStatusSchema,
+  type Buyer,
   type Expectation,
   type ExpectationLineItem,
   type ExtendedCheckoutCreateRequest,
@@ -26,7 +28,7 @@ import {
   ExtendedPaymentCredentialSchema,
   type FulfillmentDestinationRequest,
   type FulfillmentDestinationResponse,
-  type FulfillmentOptionResponse,
+  type FulfillmentOption,
   type FulfillmentRequest,
   type FulfillmentResponse,
   type LineItemCreateRequest,
@@ -34,24 +36,13 @@ import {
   type Order,
   type OrderLineItem,
   type PaymentCreateRequest,
-  PaymentDataSchema,
+  CheckoutCompleteRequestSchema,
+  type CheckoutCompleteRequest,
   type PostalAddress,
 } from "../models";
 import { type IdParamContext } from "../utils/validation";
 
-/**
- * Schema for the request body when completing a checkout session.
- */
-export const zCompleteCheckoutRequest = z
-  .object({
-    risk_signals: z.record(z.string(), z.unknown()).optional(),
-  })
-  .extend(PaymentDataSchema.shape);
-
-/**
- * Type definition for the complete checkout request body.
- */
-export type CompleteCheckoutRequest = z.infer<typeof zCompleteCheckoutRequest>;
+// zCompleteCheckoutRequest and CompleteCheckoutRequest are now imported from SDK models
 
 /**
  * Service for managing checkout sessions.
@@ -86,10 +77,13 @@ export class CheckoutService {
       let profileData:
         | {
             ucp?: {
-              capabilities?: Array<{
-                name: string;
-                config?: { webhook_url?: string };
-              }>;
+              capabilities?: Record<
+                string,
+                Array<{
+                  name: string;
+                  config?: { webhook_url?: string };
+                }>
+              >;
             };
           }
         | undefined;
@@ -108,11 +102,13 @@ export class CheckoutService {
       }
 
       if (profileData && profileData.ucp && profileData.ucp.capabilities) {
-        const orderCap = profileData.ucp.capabilities.find(
-          (c) => c.name === "dev.ucp.shopping.order"
-        );
-        if (orderCap && orderCap.config && orderCap.config.webhook_url) {
-          return { webhook_url: orderCap.config.webhook_url };
+        const orderCaps =
+          profileData.ucp.capabilities["dev.ucp.shopping.order"];
+        if (orderCaps && orderCaps.length > 0) {
+          const orderCap = orderCaps[0];
+          if (orderCap && orderCap.config && orderCap.config.webhook_url) {
+            return { webhook_url: orderCap.config.webhook_url };
+          }
         }
       }
     } catch (e) {
@@ -130,8 +126,8 @@ export class CheckoutService {
     }
     const webhookUrl = checkout.platform.webhook_url;
     let orderData: Order | undefined = undefined;
-    if (checkout.order_id) {
-      orderData = getOrder(checkout.order_id);
+    if (checkout.order) {
+      orderData = getOrder(checkout.order.id);
     }
 
     const payload = {
@@ -151,56 +147,80 @@ export class CheckoutService {
     }
   }
 
+  private addressesMatch(
+    addr1: FulfillmentDestinationResponse,
+    addr2: FulfillmentDestinationRequest
+  ): boolean {
+    return (
+      addr1.street_address === addr2.street_address &&
+      addr1.address_locality === addr2.address_locality &&
+      addr1.address_region === addr2.address_region &&
+      addr1.address_country === addr2.address_country &&
+      addr1.postal_code === addr2.postal_code
+    );
+  }
+
   private constructFulfillmentResponse(
     reqFulfillment: FulfillmentRequest | undefined,
     lineItems: LineItemResponse[],
+    buyer?: Buyer | null,
     existingFulfillment?: FulfillmentResponse
   ): FulfillmentResponse | undefined {
     if (!reqFulfillment) {
       return undefined;
     }
 
-    const mockDestinations: FulfillmentDestinationResponse[] = [
-      {
-        id: "dest_1",
-        name: "Home (US)",
-        address_country: "US",
-        address: {
-          address_country: "US",
-          street_address: "1600 Amphitheatre Pkwy",
-          address_locality: "Mountain View",
-          address_region: "CA",
-          postal_code: "94043",
-          full_name: "John Doe",
-        },
-      },
-      {
-        id: "dest_2",
-        name: "Office (DE)",
-        address_country: "DE",
-        address: {
-          address_country: "DE",
-          street_address: "ABC Str. 1",
-          address_locality: "Berlin",
-          postal_code: "10115",
-          full_name: "Max Mustermann",
-        },
-      },
-    ];
+    const isKnownCustomer = buyer?.email === "john.doe@example.com";
+    const mockDestinations: FulfillmentDestinationResponse[] = isKnownCustomer
+      ? [
+          {
+            id: "addr_1",
+            address_country: "US",
+            street_address: "123 Main St",
+            address_locality: "Springfield",
+            address_region: "IL",
+            postal_code: "62704",
+            first_name: "John",
+            last_name: "Doe",
+          },
+          {
+            id: "addr_2",
+            address_country: "US",
+            street_address: "456 Oak Ave",
+            address_locality: "Metropolis",
+            address_region: "NY",
+            postal_code: "10012",
+            first_name: "John",
+            last_name: "Doe",
+          },
+        ]
+      : [];
 
     return {
       methods: (reqFulfillment.methods || []).map((m) => {
-        // Use provided destinations or fallback to mock
-        let destinations: FulfillmentDestinationResponse[] = mockDestinations;
+        let destinations: FulfillmentDestinationResponse[] | undefined =
+          undefined;
         if (m.destinations && Array.isArray(m.destinations)) {
           destinations = m.destinations.map(
-            (d): FulfillmentDestinationResponse => ({
-              ...d,
-              id: d.id || `dest_${uuidv4()}`,
-            })
+            (d): FulfillmentDestinationResponse => {
+              if (!d.id) {
+                const matched = mockDestinations.find((md) =>
+                  this.addressesMatch(md, d)
+                );
+                if (matched) {
+                  return {
+                    ...d,
+                    id: matched.id,
+                  } as FulfillmentDestinationResponse;
+                }
+              }
+              return {
+                ...d,
+                id: d.id || `dest_${uuidv4()}`,
+              } as FulfillmentDestinationResponse;
+            }
           );
         } else if (existingFulfillment && existingFulfillment.methods) {
-          // Default to shipping if type is not provided in request
           const targetType = m.type || "shipping";
           const existingMethod = existingFulfillment.methods.find(
             (em) => em.type === targetType
@@ -208,9 +228,10 @@ export class CheckoutService {
           if (existingMethod && existingMethod.destinations) {
             destinations = existingMethod.destinations;
           }
+        } else if (isKnownCustomer) {
+          destinations = mockDestinations;
         }
 
-        // Initialize groups, preserving selection if provided
         const groups = (m.groups || []).map((g) => ({
           id: `group_${uuidv4()}`,
           line_item_ids: lineItems.map((li) => li.id),
@@ -222,7 +243,7 @@ export class CheckoutService {
           id: `method_${uuidv4()}`,
           type: m.type || "shipping",
           line_item_ids: lineItems.map((li) => li.id),
-          destinations,
+          ...(destinations ? { destinations } : {}),
           selected_destination_id: m.selected_destination_id,
           groups,
         };
@@ -274,25 +295,36 @@ export class CheckoutService {
           }
 
           if (dest && country) {
-            const options: FulfillmentOptionResponse[] = [];
+            const options: FulfillmentOption[] = [];
 
             if (country === "US") {
+              const hasRoses = checkout.line_items.some(
+                (li) => li.item.id === "bouquet_roses"
+              );
+              const isExpensive = grandTotal >= 10000;
+              const stdShipCost = hasRoses || isExpensive ? 0 : 500;
+
               options.push(
                 {
                   id: "std-ship",
-                  title: "Standard Shipping",
+                  title:
+                    stdShipCost === 0
+                      ? "Free Standard Shipping"
+                      : "Standard Shipping",
                   description: "Arrives in 5-7 days",
-                  total: 500,
-                  subtotal: 500,
-                  tax: 0,
+                  totals: [
+                    { type: "subtotal", amount: stdShipCost },
+                    { type: "total", amount: stdShipCost },
+                  ],
                 },
                 {
                   id: "exp-ship-us",
                   title: "Express Shipping (US)",
                   description: "Arrives in 2 days",
-                  total: 1500,
-                  subtotal: 1500,
-                  tax: 0,
+                  totals: [
+                    { type: "subtotal", amount: 1500 },
+                    { type: "total", amount: 1500 },
+                  ],
                 }
               );
             } else {
@@ -300,9 +332,10 @@ export class CheckoutService {
                 id: "exp-ship-intl",
                 title: "International Express",
                 description: "Arrives in 5-10 days",
-                total: 3000,
-                subtotal: 3000,
-                tax: 0,
+                totals: [
+                  { type: "subtotal", amount: 3000 },
+                  { type: "total", amount: 3000 },
+                ],
               });
             }
 
@@ -326,14 +359,17 @@ export class CheckoutService {
             for (const group of method.groups) {
               if (group.selected_option_id && group.options) {
                 const selected = group.options.find(
-                  (o: FulfillmentOptionResponse) =>
-                    o.id === group.selected_option_id
+                  (o: FulfillmentOption) => o.id === group.selected_option_id
                 );
                 if (selected) {
-                  grandTotal += selected.total;
+                  const totalObj = selected.totals.find(
+                    (t) => t.type === "total"
+                  );
+                  const totalAmount = totalObj ? totalObj.amount : 0;
+                  grandTotal += totalAmount;
                   checkout.totals.push({
                     type: "fulfillment",
-                    amount: selected.total,
+                    amount: totalAmount,
                     display_text: selected.title,
                   });
                 }
@@ -351,7 +387,9 @@ export class CheckoutService {
     checkout.discounts.applied = [];
     if (checkout.discounts.codes) {
       for (const code of checkout.discounts.codes) {
-        if (typeof code === "string" && code.toUpperCase() === "10OFF") {
+        if (typeof code !== "string") continue;
+        const upperCode = code.toUpperCase();
+        if (upperCode === "10OFF") {
           const discountAmount = Math.floor(grandTotal * 0.1);
           grandTotal -= discountAmount;
           checkout.discounts.applied.push({
@@ -360,10 +398,42 @@ export class CheckoutService {
             amount: discountAmount,
             allocations: [{ path: "subtotal", amount: discountAmount }],
           });
-          // totals[] carries the signed effect on the receipt: negative for a
-          // discount (total.json exclusiveMaximum: 0). The applied[].amount
-          // above stays positive as the magnitude (discount.md).
           checkout.totals.push({ type: "discount", amount: -discountAmount });
+        } else if (upperCode === "WELCOME20") {
+          const discountAmount = Math.floor(grandTotal * 0.2);
+          grandTotal -= discountAmount;
+          checkout.discounts.applied.push({
+            code,
+            title: "Welcome 20% Off",
+            amount: discountAmount,
+            allocations: [{ path: "subtotal", amount: discountAmount }],
+          });
+          checkout.totals.push({ type: "discount", amount: -discountAmount });
+        } else if (upperCode === "FIXED500") {
+          const discountAmount = Math.min(grandTotal, 500);
+          grandTotal -= discountAmount;
+          checkout.discounts.applied.push({
+            code,
+            title: "$5.00 Off",
+            amount: discountAmount,
+            allocations: [{ path: "subtotal", amount: discountAmount }],
+          });
+          checkout.totals.push({ type: "discount", amount: -discountAmount });
+        }
+      }
+    }
+
+    // Enrich Buyer Consent if present
+    if (checkout.buyer?.consent) {
+      for (const [purpose, value] of Object.entries(checkout.buyer.consent)) {
+        if (value && typeof value === "object") {
+          const consentValue = value as any;
+          if (!consentValue.description) {
+            consentValue.description = `Consent for ${purpose}`;
+          }
+          if (!consentValue.source) {
+            consentValue.source = "platform";
+          }
         }
       }
     }
@@ -441,7 +511,8 @@ export class CheckoutService {
 
       const fulfillment = this.constructFulfillmentResponse(
         _reqFulfillment,
-        lineItems
+        lineItems,
+        request.buyer
       );
 
       // Construct authoritative checkout
@@ -451,27 +522,24 @@ export class CheckoutService {
         ...requestBody, // Copy other fields like ucp, etc.
         id: checkoutId,
         fulfillment,
-        ucp: { version: "2022-01-01", capabilities: [] },
+        ucp: {
+          version: UCP_VERSION,
+          capabilities: {
+            "dev.ucp.shopping.checkout": [
+              {
+                name: "dev.ucp.shopping.checkout",
+                version: UCP_VERSION,
+              },
+            ],
+          },
+        },
         status: CheckoutResponseStatusSchema.enum.incomplete,
-        currency: request.currency || "USD",
+        currency: "USD",
         line_items: lineItems,
         totals: [],
         links: [],
         platform: platformConfig,
-        payment: {
-          ...request.payment,
-          handlers: [
-            {
-              id: "google_pay",
-              name: "google.pay",
-              version: "2025-03-25",
-              spec: "https://example.com/spec",
-              config_schema: "https://example.com/schema",
-              instrument_schemas: ["https://example.com/instrument_schema"],
-              config: {},
-            },
-          ],
-        },
+        payment: request.payment,
       };
 
       // Calculate totals and validate inventory
@@ -558,7 +626,6 @@ export class CheckoutService {
     if (platformConfig) {
       existing.platform = platformConfig;
     }
-    existing.currency = updateRequest.currency;
 
     // Simple merge for payment. In real world, this might be more complex.
     existing.payment = {
@@ -602,6 +669,7 @@ export class CheckoutService {
       existing.fulfillment = this.constructFulfillmentResponse(
         updateRequest.fulfillment,
         existing.line_items,
+        existing.buyer,
         existing.fulfillment
       );
     }
@@ -634,7 +702,7 @@ export class CheckoutService {
   completeCheckout = async (c: IdParamContext) => {
     const { id } = c.req.valid("param");
     const idempotencyKey = c.req.header("Idempotency-Key");
-    const rawBody = await c.req.json<CompleteCheckoutRequest>();
+    const rawBody = await c.req.json<CheckoutCompleteRequest>();
     let requestHash = "";
 
     // Idempotency check for payment data
@@ -660,6 +728,20 @@ export class CheckoutService {
       return c.json({ detail: "Checkout session not found" }, 404);
     }
 
+    // Validate Fulfillment is complete
+    const hasFulfillment = checkout.fulfillment?.methods?.every(
+      (method) =>
+        method.selected_destination_id &&
+        method.groups?.every((group) => group.selected_option_id)
+    );
+
+    if (!hasFulfillment) {
+      return c.json(
+        { detail: "Fulfillment address and option must be selected" },
+        400
+      );
+    }
+
     if (
       checkout.status === CheckoutResponseStatusSchema.enum.completed ||
       checkout.status === CheckoutResponseStatusSchema.enum.canceled
@@ -669,11 +751,11 @@ export class CheckoutService {
     }
 
     // Process Payment
-    const selectedInstrument = rawBody.payment_data;
-
-    if (!selectedInstrument) {
+    const payment = rawBody.payment;
+    if (!payment || !payment.instruments || payment.instruments.length === 0) {
       return c.json({ detail: "Missing payment data" }, 400);
     }
+    const selectedInstrument = payment.instruments[0];
 
     if (selectedInstrument) {
       const handlerId = selectedInstrument.handler_id;
@@ -777,7 +859,7 @@ export class CheckoutService {
             for (const group of method.groups) {
               if (group.selected_option_id && group.options) {
                 const selected = group.options.find(
-                  (opt: FulfillmentOptionResponse) =>
+                  (opt: FulfillmentOption) =>
                     opt.id === group.selected_option_id
                 );
                 if (selected) {
@@ -838,13 +920,16 @@ export class CheckoutService {
         fulfillment: {
           expectations,
         },
+        currency: checkout.currency,
       };
 
       saveOrder(order.id, order);
 
       // Save Checkout
-      checkout.order_id = orderId;
-      checkout.order_permalink_url = order.permalink_url;
+      checkout.order = {
+        id: orderId,
+        permalink_url: order.permalink_url,
+      };
 
       saveCheckout(id, checkout.status, checkout);
 
diff --git a/rest/nodejs/src/api/discovery.ts b/rest/nodejs/src/api/discovery.ts
index dce811bc..c179166b 100644
--- a/rest/nodejs/src/api/discovery.ts
+++ b/rest/nodejs/src/api/discovery.ts
@@ -1,4 +1,5 @@
 import { type Context } from "hono";
+import { UCP_VERSION } from "../utils/config";
 
 type DiscoveryCapability = {
   version: string;
@@ -15,10 +16,21 @@ type DiscoveryServiceBinding = {
   endpoint: string;
 };
 
+type DiscoveryPaymentHandler = {
+  id: string;
+  name: string;
+  version: string;
+  spec: string;
+  config_schema: string;
+  instrument_schemas: string[];
+  config: Record<string, any>;
+};
+
 type UcpDiscoveryMetadata = {
   version: string;
   services: Record<string, DiscoveryServiceBinding[]>;
   capabilities: Record<string, DiscoveryCapability[]>;
+  payment_handlers: Record<string, DiscoveryPaymentHandler[]>;
 };
 
 /**
@@ -30,7 +42,7 @@ type UcpDiscoveryMetadata = {
  * capabilities (checkout, order, etc.), and supported payment handlers.
  */
 export class DiscoveryService {
-  readonly ucpVersion = "2026-01-23";
+  readonly ucpVersion = UCP_VERSION;
 
   /**
    * Returns the merchant profile, detailing the server's UCP configuration.
@@ -44,15 +56,60 @@ export class DiscoveryService {
    * @returns A JSON response containing the merchant profile.
    */
   getMerchantProfile = (c: Context) => {
+    const payment_handlers = {
+      "com.shopify.shop_pay": [
+        {
+          id: "shop_pay",
+          name: "com.shopify.shop_pay",
+          version: this.ucpVersion,
+          spec: "https://shopify.dev/ucp/handlers/shop_pay",
+          config_schema:
+            "https://shopify.dev/ucp/handlers/shop_pay/config.json",
+          instrument_schemas: [
+            "https://shopify.dev/ucp/handlers/shop_pay/instrument.json",
+          ],
+          config: {
+            shop_id: "test-shop-id",
+          },
+        },
+      ],
+      "google.pay": [
+        {
+          id: "google_pay",
+          name: "google.pay",
+          version: "1.0",
+          spec: "https://example.com/spec",
+          config_schema: "https://example.com/schema",
+          instrument_schemas: [],
+          config: {},
+        },
+      ],
+      "dev.ucp.mock_payment": [
+        {
+          id: "mock_payment_handler",
+          name: "dev.ucp.mock_payment",
+          version: "1.0",
+          spec: `https://ucp.dev/${this.ucpVersion}/specification/mock`,
+          config_schema: `https://ucp.dev/${this.ucpVersion}/schemas/mock.json`,
+          instrument_schemas: [
+            `https://ucp.dev/${this.ucpVersion}/schemas/shopping/types/card_payment_instrument.json`,
+          ],
+          config: {
+            supported_tokens: ["success_token", "fail_token"],
+          },
+        },
+      ],
+    };
+
     const ucp = {
       version: this.ucpVersion,
       services: {
         "dev.ucp.shopping": [
           {
             version: this.ucpVersion,
-            spec: "https://ucp.dev/2026-01-23/specification/shopping",
+            spec: `https://ucp.dev/${this.ucpVersion}/specification/shopping`,
             transport: "rest",
-            schema: "https://ucp.dev/2026-01-23/services/shopping/openapi.json",
+            schema: `https://ucp.dev/${this.ucpVersion}/services/shopping/openapi.json`,
             endpoint: "http://localhost:3000",
           },
         ],
@@ -61,110 +118,76 @@ export class DiscoveryService {
         "dev.ucp.shopping.checkout": [
           {
             version: this.ucpVersion,
-            spec: "https://ucp.dev/2026-01-23/specification/shopping/checkout",
-            schema: "https://ucp.dev/2026-01-23/schemas/shopping/checkout.json",
+            spec: `https://ucp.dev/${this.ucpVersion}/specification/shopping/checkout`,
+            schema: `https://ucp.dev/${this.ucpVersion}/schemas/shopping/checkout.json`,
           },
         ],
         "dev.ucp.shopping.order": [
           {
             version: this.ucpVersion,
-            spec: "https://ucp.dev/2026-01-23/specification/shopping/order",
-            schema: "https://ucp.dev/2026-01-23/schemas/shopping/order.json",
+            spec: `https://ucp.dev/${this.ucpVersion}/specification/shopping/order`,
+            schema: `https://ucp.dev/${this.ucpVersion}/schemas/shopping/order.json`,
           },
         ],
         "dev.ucp.shopping.refund": [
           {
             version: this.ucpVersion,
-            spec: "https://ucp.dev/2026-01-23/specification/shopping/refund",
-            schema: "https://ucp.dev/2026-01-23/schemas/shopping/refund.json",
+            spec: `https://ucp.dev/${this.ucpVersion}/specification/shopping/refund`,
+            schema: `https://ucp.dev/${this.ucpVersion}/schemas/shopping/refund.json`,
             extends: "dev.ucp.shopping.order",
           },
         ],
         "dev.ucp.shopping.return": [
           {
             version: this.ucpVersion,
-            spec: "https://ucp.dev/2026-01-23/specification/shopping/return",
-            schema: "https://ucp.dev/2026-01-23/schemas/shopping/return.json",
+            spec: `https://ucp.dev/${this.ucpVersion}/specification/shopping/return`,
+            schema: `https://ucp.dev/${this.ucpVersion}/schemas/shopping/return.json`,
             extends: "dev.ucp.shopping.order",
           },
         ],
         "dev.ucp.shopping.dispute": [
           {
             version: this.ucpVersion,
-            spec: "https://ucp.dev/2026-01-23/specification/shopping/dispute",
-            schema: "https://ucp.dev/2026-01-23/schemas/shopping/dispute.json",
+            spec: `https://ucp.dev/${this.ucpVersion}/specification/shopping/dispute`,
+            schema: `https://ucp.dev/${this.ucpVersion}/schemas/shopping/dispute.json`,
             extends: "dev.ucp.shopping.order",
           },
         ],
         "dev.ucp.shopping.discount": [
           {
             version: this.ucpVersion,
-            spec: "https://ucp.dev/2026-01-23/specification/shopping/discount",
-            schema: "https://ucp.dev/2026-01-23/schemas/shopping/discount.json",
+            spec: `https://ucp.dev/${this.ucpVersion}/specification/shopping/discount`,
+            schema: `https://ucp.dev/${this.ucpVersion}/schemas/shopping/discount.json`,
             extends: "dev.ucp.shopping.checkout",
           },
         ],
         "dev.ucp.shopping.fulfillment": [
           {
             version: this.ucpVersion,
-            spec: "https://ucp.dev/2026-01-23/specification/shopping/fulfillment",
-            schema:
-              "https://ucp.dev/2026-01-23/schemas/shopping/fulfillment.json",
+            spec: `https://ucp.dev/${this.ucpVersion}/specification/shopping/fulfillment`,
+            schema: `https://ucp.dev/${this.ucpVersion}/schemas/shopping/fulfillment.json`,
             extends: "dev.ucp.shopping.checkout",
           },
         ],
         "dev.ucp.shopping.buyer_consent": [
           {
             version: this.ucpVersion,
-            spec: "https://ucp.dev/2026-01-23/specification/shopping/buyer_consent",
-            schema:
-              "https://ucp.dev/2026-01-23/schemas/shopping/buyer_consent.json",
+            spec: `https://ucp.dev/${this.ucpVersion}/specification/shopping/buyer_consent`,
+            schema: `https://ucp.dev/${this.ucpVersion}/schemas/shopping/buyer_consent.json`,
             extends: "dev.ucp.shopping.checkout",
           },
         ],
       },
+      payment_handlers,
     } satisfies UcpDiscoveryMetadata;
 
     const discoveryProfile = {
       ucp,
       payment: {
         handlers: [
-          {
-            id: "shop_pay",
-            name: "com.shopify.shop_pay",
-            version: "2026-01-23",
-            spec: "https://shopify.dev/ucp/handlers/shop_pay",
-            config_schema:
-              "https://shopify.dev/ucp/handlers/shop_pay/config.json",
-            instrument_schemas: [
-              "https://shopify.dev/ucp/handlers/shop_pay/instrument.json",
-            ],
-            config: {
-              shop_id: "test-shop-id",
-            },
-          },
-          {
-            id: "google_pay",
-            name: "google.pay",
-            version: "1.0",
-            spec: "https://example.com/spec",
-            config_schema: "https://example.com/schema",
-            instrument_schemas: [],
-            config: {},
-          },
-          {
-            id: "mock_payment_handler",
-            name: "dev.ucp.mock_payment",
-            version: "1.0",
-            spec: "https://ucp.dev/2026-01-23/specification/mock",
-            config_schema: "https://ucp.dev/2026-01-23/schemas/mock.json",
-            instrument_schemas: [
-              "https://ucp.dev/2026-01-23/schemas/shopping/types/card_payment_instrument.json",
-            ],
-            config: {
-              supported_tokens: ["success_token", "fail_token"],
-            },
-          },
+          ...payment_handlers["com.shopify.shop_pay"],
+          ...payment_handlers["google.pay"],
+          ...payment_handlers["dev.ucp.mock_payment"],
         ],
       },
     };
diff --git a/rest/nodejs/src/index.ts b/rest/nodejs/src/index.ts
index 6e339d73..321ceaff 100644
--- a/rest/nodejs/src/index.ts
+++ b/rest/nodejs/src/index.ts
@@ -4,7 +4,7 @@ import { type Context, Hono } from "hono";
 import { requestId } from "hono/request-id";
 import { pinoHttp } from "pino-http";
 
-import { CheckoutService, zCompleteCheckoutRequest } from "./api/checkout";
+import { CheckoutService } from "./api/checkout";
 import { DiscoveryService } from "./api/discovery";
 import { OrderService } from "./api/order";
 import { TestingService } from "./api/testing";
@@ -12,6 +12,7 @@ import { initDbs } from "./data/db";
 import {
   ExtendedCheckoutCreateRequestSchema,
   ExtendedCheckoutUpdateRequestSchema,
+  CheckoutCompleteRequestSchema,
   OrderSchema,
 } from "./models";
 import { IdParamSchema, prettyValidation } from "./utils/validation";
@@ -94,7 +95,7 @@ app.put(
 app.post(
   "/checkout-sessions/:id/complete",
   zValidator("param", IdParamSchema, prettyValidation),
-  zValidator("json", zCompleteCheckoutRequest, prettyValidation),
+  zValidator("json", CheckoutCompleteRequestSchema, prettyValidation),
   checkoutService.completeCheckout
 );
 app.post(
diff --git a/rest/nodejs/src/models/extensions.ts b/rest/nodejs/src/models/extensions.ts
deleted file mode 100644
index 7c8da194..00000000
--- a/rest/nodejs/src/models/extensions.ts
+++ /dev/null
@@ -1,61 +0,0 @@
-import { z } from "zod";
-
-import {
-  CheckoutCreateRequestSchema,
-  CheckoutUpdateRequestSchema,
-  CheckoutWithBuyerConsentSchema,
-  CheckoutWithDiscountSchema,
-  CheckoutWithFulfillmentCreateRequestSchema,
-  CheckoutWithFulfillmentResponseSchema,
-  CheckoutWithFulfillmentUpdateRequestSchema,
-  FulfillmentDestinationResponseSchema,
-  OrderSchema,
-  PaymentCredentialSchema,
-} from "./spec_generated";
-
-export const ExtendedPaymentCredentialSchema = PaymentCredentialSchema.extend({
-  token: z.string().optional(),
-});
-export type ExtendedPaymentCredential = z.infer<
-  typeof ExtendedPaymentCredentialSchema
->;
-
-export const PlatformConfigSchema = z.object({
-  webhook_url: z.string().url().optional(),
-});
-export type PlatformConfig = z.infer<typeof PlatformConfigSchema>;
-
-export const ExtendedCheckoutResponseSchema =
-  CheckoutWithFulfillmentResponseSchema.extend(CheckoutWithDiscountSchema.shape)
-    .extend(CheckoutWithBuyerConsentSchema.shape)
-    .extend({
-      order_id: z.string().optional(),
-      order_permalink_url: z.string().optional(),
-      platform: PlatformConfigSchema.optional(),
-    });
-export type ExtendedCheckoutResponse = z.infer<
-  typeof ExtendedCheckoutResponseSchema
->;
-
-export const ExtendedCheckoutCreateRequestSchema =
-  CheckoutCreateRequestSchema.extend(
-    CheckoutWithFulfillmentCreateRequestSchema.pick({ fulfillment: true }).shape
-  )
-    .extend(CheckoutWithDiscountSchema.pick({ discounts: true }).shape)
-    .extend(CheckoutWithBuyerConsentSchema.pick({ buyer: true }).shape);
-export type ExtendedCheckoutCreateRequest = z.infer<
-  typeof ExtendedCheckoutCreateRequestSchema
->;
-
-export const ExtendedCheckoutUpdateRequestSchema =
-  CheckoutUpdateRequestSchema.extend(
-    CheckoutWithFulfillmentUpdateRequestSchema.pick({ fulfillment: true }).shape
-  )
-    .extend(CheckoutWithDiscountSchema.pick({ discounts: true }).shape)
-    .extend(CheckoutWithBuyerConsentSchema.pick({ buyer: true }).shape);
-export type ExtendedCheckoutUpdateRequest = z.infer<
-  typeof ExtendedCheckoutUpdateRequestSchema
->;
-
-export const OrderUpdateSchema = OrderSchema;
-export type OrderUpdate = z.infer<typeof OrderUpdateSchema>;
diff --git a/rest/nodejs/src/models/index.ts b/rest/nodejs/src/models/index.ts
index 28e98807..572faade 100644
--- a/rest/nodejs/src/models/index.ts
+++ b/rest/nodejs/src/models/index.ts
@@ -1,2 +1 @@
-export * from "./extensions";
-export * from "./spec_generated";
+export * from "@ucp-js/sdk";
diff --git a/rest/nodejs/src/models/spec_generated.ts b/rest/nodejs/src/models/spec_generated.ts
deleted file mode 100644
index 50920ce2..00000000
--- a/rest/nodejs/src/models/spec_generated.ts
+++ /dev/null
@@ -1,1016 +0,0 @@
-import * as z from "zod";
-
-// Key usage. Should be 'sig' for signing keys.
-
-export const UseSchema = z.enum(["enc", "sig"]);
-export type Use = z.infer<typeof UseSchema>;
-
-// The type of card number. Network tokens are preferred with fallback to FPAN.
-// See PCI Scope for more details.
-
-export const CardNumberTypeSchema = z.enum(["dpan", "fpan", "network_token"]);
-export type CardNumberType = z.infer<typeof CardNumberTypeSchema>;
-
-// A URI pointing to a schema definition (e.g., JSON Schema) used to validate
-// the structure of the instrument object.
-
-export const CardPaymentInstrumentTypeSchema = z.enum(["card"]);
-export type CardPaymentInstrumentType = z.infer<
-  typeof CardPaymentInstrumentTypeSchema
->;
-
-// Type of total categorization.
-
-export const TotalResponseTypeSchema = z.enum([
-  "discount",
-  "fee",
-  "fulfillment",
-  "items_discount",
-  "subtotal",
-  "tax",
-  "total",
-]);
-export type TotalResponseType = z.infer<typeof TotalResponseTypeSchema>;
-
-// Content format, default = plain.
-
-export const ContentTypeSchema = z.enum(["markdown", "plain"]);
-export type ContentType = z.infer<typeof ContentTypeSchema>;
-
-// Declares who resolves this error. 'recoverable': agent can fix via API.
-// 'requires_buyer_input': merchant requires information their API doesn't
-// support collecting programmatically (checkout incomplete).
-// 'requires_buyer_review': buyer must authorize before order placement due to
-// policy, regulatory, or entitlement rules (checkout complete). Errors with
-// 'requires_*' severity contribute to 'status: requires_escalation'.
-
-export const SeveritySchema = z.enum([
-  "recoverable",
-  "requires_buyer_input",
-  "requires_buyer_review",
-]);
-export type Severity = z.infer<typeof SeveritySchema>;
-
-export const MessageTypeSchema = z.enum(["error", "info", "warning"]);
-export type MessageType = z.infer<typeof MessageTypeSchema>;
-
-// Checkout state indicating the current phase and required action. See Checkout
-// Status lifecycle documentation for state transition details.
-
-export const CheckoutResponseStatusSchema = z.enum([
-  "canceled",
-  "complete_in_progress",
-  "completed",
-  "incomplete",
-  "ready_for_complete",
-  "requires_escalation",
-]);
-export type CheckoutResponseStatus = z.infer<
-  typeof CheckoutResponseStatusSchema
->;
-
-// Adjustment status.
-
-export const AdjustmentStatusSchema = z.enum([
-  "completed",
-  "failed",
-  "pending",
-]);
-export type AdjustmentStatus = z.infer<typeof AdjustmentStatusSchema>;
-
-// Delivery method type (shipping, pickup, digital).
-
-export const MethodTypeSchema = z.enum(["digital", "pickup", "shipping"]);
-export type MethodType = z.infer<typeof MethodTypeSchema>;
-
-// Derived status: fulfilled if quantity.fulfilled == quantity.total, partial if
-// quantity.fulfilled > 0, otherwise processing.
-
-export const OrderLineItemStatusSchema = z.enum([
-  "fulfilled",
-  "partial",
-  "processing",
-]);
-export type OrderLineItemStatus = z.infer<typeof OrderLineItemStatusSchema>;
-
-// Fulfillment method type this availability applies to.
-//
-// Fulfillment method type.
-
-export const TypeElementSchema = z.enum(["pickup", "shipping"]);
-export type TypeElement = z.infer<typeof TypeElementSchema>;
-
-export const MessageErrorTypeSchema = z.enum(["error"]);
-export type MessageErrorType = z.infer<typeof MessageErrorTypeSchema>;
-
-export const MessageInfoTypeSchema = z.enum(["info"]);
-export type MessageInfoType = z.infer<typeof MessageInfoTypeSchema>;
-
-export const MessageWarningTypeSchema = z.enum(["warning"]);
-export type MessageWarningType = z.infer<typeof MessageWarningTypeSchema>;
-
-// Current fulfillment status.
-
-export const OrderFulfillmentDetailStatusSchema = z.enum([
-  "canceled",
-  "delivered",
-  "failed_attempt",
-  "in_transit",
-  "out_for_delivery",
-  "processing",
-  "shipped",
-]);
-export type OrderFulfillmentDetailStatus = z.infer<
-  typeof OrderFulfillmentDetailStatusSchema
->;
-
-// Allocation method. 'each' = applied independently per item. 'across' = split
-// proportionally by value.
-
-export const MethodSchema = z.enum(["across", "each"]);
-export type Method = z.infer<typeof MethodSchema>;
-
-export const PaymentHandlerResponseSchema = z.object({
-  config: z.record(z.string(), z.any()),
-  config_schema: z.string(),
-  id: z.string(),
-  instrument_schemas: z.array(z.string()),
-  name: z.string(),
-  spec: z.string(),
-  version: z.string(),
-});
-export type PaymentHandlerResponse = z.infer<
-  typeof PaymentHandlerResponseSchema
->;
-
-export const SigningKeySchema = z.object({
-  alg: z.string().optional(),
-  crv: z.string().optional(),
-  e: z.string().optional(),
-  kid: z.string(),
-  kty: z.string(),
-  n: z.string().optional(),
-  use: UseSchema.optional(),
-  x: z.string().optional(),
-  y: z.string().optional(),
-});
-export type SigningKey = z.infer<typeof SigningKeySchema>;
-
-export const CapabilityDiscoverySchema = z.object({
-  config: z.record(z.string(), z.any()).optional(),
-  extends: z.string().optional(),
-  name: z.string(),
-  schema: z.string(),
-  spec: z.string(),
-  version: z.string(),
-});
-export type CapabilityDiscovery = z.infer<typeof CapabilityDiscoverySchema>;
-
-export const A2ASchema = z.object({
-  endpoint: z.string(),
-});
-export type A2A = z.infer<typeof A2ASchema>;
-
-export const EmbeddedSchema = z.object({
-  schema: z.string(),
-});
-export type Embedded = z.infer<typeof EmbeddedSchema>;
-
-export const McpSchema = z.object({
-  endpoint: z.string(),
-  schema: z.string(),
-});
-export type Mcp = z.infer<typeof McpSchema>;
-
-export const RestSchema = z.object({
-  endpoint: z.string(),
-  schema: z.string(),
-});
-export type Rest = z.infer<typeof RestSchema>;
-
-export const BuyerSchema = z.object({
-  email: z.string().optional(),
-  first_name: z.string().optional(),
-  full_name: z.string().optional(),
-  last_name: z.string().optional(),
-  phone_number: z.string().optional(),
-});
-export type Buyer = z.infer<typeof BuyerSchema>;
-
-export const ItemCreateRequestSchema = z.object({
-  id: z.string(),
-});
-export type ItemCreateRequest = z.infer<typeof ItemCreateRequestSchema>;
-
-export const PostalAddressSchema = z.object({
-  address_country: z.string().optional(),
-  address_locality: z.string().optional(),
-  address_region: z.string().optional(),
-  extended_address: z.string().optional(),
-  first_name: z.string().optional(),
-  full_name: z.string().optional(),
-  last_name: z.string().optional(),
-  phone_number: z.string().optional(),
-  postal_code: z.string().optional(),
-  street_address: z.string().optional(),
-});
-export type PostalAddress = z.infer<typeof PostalAddressSchema>;
-
-export const PaymentCredentialSchema = z.object({
-  type: z.string(),
-  card_number_type: CardNumberTypeSchema.optional(),
-  cryptogram: z.string().optional(),
-  cvc: z.string().optional(),
-  eci_value: z.string().optional(),
-  expiry_month: z.number().optional(),
-  expiry_year: z.number().optional(),
-  name: z.string().optional(),
-  number: z.string().optional(),
-});
-export type PaymentCredential = z.infer<typeof PaymentCredentialSchema>;
-
-export const ItemResponseSchema = z.object({
-  id: z.string(),
-  image_url: z.string().optional(),
-  price: z.number(),
-  title: z.string(),
-});
-export type ItemResponse = z.infer<typeof ItemResponseSchema>;
-
-export const TotalResponseSchema = z.object({
-  amount: z.number(),
-  display_text: z.string().optional(),
-  type: TotalResponseTypeSchema,
-});
-export type TotalResponse = z.infer<typeof TotalResponseSchema>;
-
-export const LinkSchema = z.object({
-  title: z.string().optional(),
-  type: z.string(),
-  url: z.string(),
-});
-export type Link = z.infer<typeof LinkSchema>;
-
-export const MessageSchema = z.object({
-  code: z.string().optional(),
-  content: z.string(),
-  content_type: ContentTypeSchema.optional(),
-  path: z.string().optional(),
-  severity: SeveritySchema.optional(),
-  type: MessageTypeSchema,
-});
-export type Message = z.infer<typeof MessageSchema>;
-
-export const CapabilityResponseSchema = z.object({
-  config: z.record(z.string(), z.any()).optional(),
-  extends: z.string().optional(),
-  name: z.string(),
-  schema: z.string().optional(),
-  spec: z.string().optional(),
-  version: z.string(),
-});
-export type CapabilityResponse = z.infer<typeof CapabilityResponseSchema>;
-
-export const ItemUpdateRequestSchema = z.object({
-  id: z.string(),
-});
-export type ItemUpdateRequest = z.infer<typeof ItemUpdateRequestSchema>;
-
-export const AdjustmentLineItemSchema = z.object({
-  id: z.string(),
-  quantity: z.number(),
-});
-export type AdjustmentLineItem = z.infer<typeof AdjustmentLineItemSchema>;
-
-export const FulfillmentEventLineItemSchema = z.object({
-  id: z.string(),
-  quantity: z.number(),
-});
-export type FulfillmentEventLineItem = z.infer<
-  typeof FulfillmentEventLineItemSchema
->;
-
-export const ExpectationLineItemSchema = z.object({
-  id: z.string(),
-  quantity: z.number(),
-});
-export type ExpectationLineItem = z.infer<typeof ExpectationLineItemSchema>;
-
-export const QuantitySchema = z.object({
-  fulfilled: z.number(),
-  total: z.number(),
-});
-export type Quantity = z.infer<typeof QuantitySchema>;
-
-export const UcpOrderResponseSchema = z.object({
-  capabilities: z.array(CapabilityResponseSchema),
-  version: z.string(),
-});
-export type UcpOrderResponse = z.infer<typeof UcpOrderResponseSchema>;
-
-export const PaymentAccountInfoSchema = z.object({
-  payment_account_reference: z.string().optional(),
-});
-export type PaymentAccountInfo = z.infer<typeof PaymentAccountInfoSchema>;
-
-export const IdentityClassSchema = z.object({
-  access_token: z.string(),
-});
-export type IdentityClass = z.infer<typeof IdentityClassSchema>;
-
-export const CardCredentialSchema = z.object({
-  card_number_type: CardNumberTypeSchema,
-  cryptogram: z.string().optional(),
-  cvc: z.string().optional(),
-  eci_value: z.string().optional(),
-  expiry_month: z.number().optional(),
-  expiry_year: z.number().optional(),
-  name: z.string().optional(),
-  number: z.string().optional(),
-  type: CardPaymentInstrumentTypeSchema,
-});
-export type CardCredential = z.infer<typeof CardCredentialSchema>;
-
-export const CardPaymentInstrumentSchema = z.object({
-  billing_address: PostalAddressSchema.optional(),
-  credential: PaymentCredentialSchema.optional(),
-  handler_id: z.string(),
-  id: z.string(),
-  type: CardPaymentInstrumentTypeSchema,
-  brand: z.string(),
-  expiry_month: z.number().optional(),
-  expiry_year: z.number().optional(),
-  last_digits: z.string(),
-  rich_card_art: z.string().optional(),
-  rich_text_description: z.string().optional(),
-});
-export type CardPaymentInstrument = z.infer<typeof CardPaymentInstrumentSchema>;
-
-export const FulfillmentDestinationRequestSchema = z.object({
-  address_country: z.string().optional(),
-  address_locality: z.string().optional(),
-  address_region: z.string().optional(),
-  extended_address: z.string().optional(),
-  first_name: z.string().optional(),
-  full_name: z.string().optional(),
-  last_name: z.string().optional(),
-  phone_number: z.string().optional(),
-  postal_code: z.string().optional(),
-  street_address: z.string().optional(),
-  id: z.string().optional(),
-  address: PostalAddressSchema.optional(),
-  name: z.string().optional(),
-});
-export type FulfillmentDestinationRequest = z.infer<
-  typeof FulfillmentDestinationRequestSchema
->;
-
-export const FulfillmentGroupCreateRequestSchema = z.object({
-  selected_option_id: z.union([z.null(), z.string()]).optional(),
-});
-export type FulfillmentGroupCreateRequest = z.infer<
-  typeof FulfillmentGroupCreateRequestSchema
->;
-
-export const FulfillmentGroupUpdateRequestSchema = z.object({
-  id: z.string(),
-  selected_option_id: z.union([z.null(), z.string()]).optional(),
-});
-export type FulfillmentGroupUpdateRequest = z.infer<
-  typeof FulfillmentGroupUpdateRequestSchema
->;
-
-export const FulfillmentDestinationRequestElementSchema = z.object({
-  address_country: z.string().optional(),
-  address_locality: z.string().optional(),
-  address_region: z.string().optional(),
-  extended_address: z.string().optional(),
-  first_name: z.string().optional(),
-  full_name: z.string().optional(),
-  last_name: z.string().optional(),
-  phone_number: z.string().optional(),
-  postal_code: z.string().optional(),
-  street_address: z.string().optional(),
-  id: z.string().optional(),
-  address: PostalAddressSchema.optional(),
-  name: z.string().optional(),
-});
-export type FulfillmentDestinationRequestElement = z.infer<
-  typeof FulfillmentDestinationRequestElementSchema
->;
-
-export const GroupElementSchema = z.object({
-  selected_option_id: z.union([z.null(), z.string()]).optional(),
-});
-export type GroupElement = z.infer<typeof GroupElementSchema>;
-
-export const GroupClassSchema = z.object({
-  id: z.string(),
-  selected_option_id: z.union([z.null(), z.string()]).optional(),
-});
-export type GroupClass = z.infer<typeof GroupClassSchema>;
-
-export const AllowsMultiDestinationSchema = z.object({
-  pickup: z.boolean().optional(),
-  shipping: z.boolean().optional(),
-});
-export type AllowsMultiDestination = z.infer<
-  typeof AllowsMultiDestinationSchema
->;
-
-export const MessageErrorSchema = z.object({
-  code: z.string(),
-  content: z.string(),
-  content_type: ContentTypeSchema.optional(),
-  path: z.string().optional(),
-  severity: SeveritySchema,
-  type: MessageErrorTypeSchema,
-});
-export type MessageError = z.infer<typeof MessageErrorSchema>;
-
-export const MessageInfoSchema = z.object({
-  code: z.string().optional(),
-  content: z.string(),
-  content_type: ContentTypeSchema.optional(),
-  path: z.string().optional(),
-  type: MessageInfoTypeSchema,
-});
-export type MessageInfo = z.infer<typeof MessageInfoSchema>;
-
-export const MessageWarningSchema = z.object({
-  code: z.string(),
-  content: z.string(),
-  content_type: ContentTypeSchema.optional(),
-  path: z.string().optional(),
-  type: MessageWarningTypeSchema,
-});
-export type MessageWarning = z.infer<typeof MessageWarningSchema>;
-
-export const FulfillmentOptionResponseSchema = z.object({
-  carrier: z.string().optional(),
-  description: z.string().optional(),
-  earliest_fulfillment_time: z.coerce.date().optional(),
-  id: z.string(),
-  latest_fulfillment_time: z.coerce.date().optional(),
-  subtotal: z.number().optional(),
-  tax: z.number().optional(),
-  title: z.string(),
-  total: z.number(),
-});
-export type FulfillmentOptionResponse = z.infer<
-  typeof FulfillmentOptionResponseSchema
->;
-
-export const PaymentIdentitySchema = z.object({
-  access_token: z.string(),
-});
-export type PaymentIdentity = z.infer<typeof PaymentIdentitySchema>;
-
-export const PaymentInstrumentBaseSchema = z.object({
-  billing_address: PostalAddressSchema.optional(),
-  credential: PaymentCredentialSchema.optional(),
-  handler_id: z.string(),
-  id: z.string(),
-  type: z.string(),
-});
-export type PaymentInstrumentBase = z.infer<typeof PaymentInstrumentBaseSchema>;
-
-export const PlatformFulfillmentConfigSchema = z.object({
-  supports_multi_group: z.boolean().optional(),
-});
-export type PlatformFulfillmentConfig = z.infer<
-  typeof PlatformFulfillmentConfigSchema
->;
-
-export const RetailLocationRequestSchema = z.object({
-  address: PostalAddressSchema.optional(),
-  name: z.string(),
-});
-export type RetailLocationRequest = z.infer<typeof RetailLocationRequestSchema>;
-
-export const RetailLocationResponseSchema = z.object({
-  address: PostalAddressSchema.optional(),
-  id: z.string(),
-  name: z.string(),
-});
-export type RetailLocationResponse = z.infer<
-  typeof RetailLocationResponseSchema
->;
-
-export const TokenCredentialCreateRequestSchema = z.object({
-  token: z.string(),
-  type: z.string(),
-});
-export type TokenCredentialCreateRequest = z.infer<
-  typeof TokenCredentialCreateRequestSchema
->;
-
-export const TokenCredentialResponseSchema = z.object({
-  type: z.string(),
-});
-export type TokenCredentialResponse = z.infer<
-  typeof TokenCredentialResponseSchema
->;
-
-export const TokenCredentialUpdateRequestSchema = z.object({
-  token: z.string(),
-  type: z.string(),
-});
-export type TokenCredentialUpdateRequest = z.infer<
-  typeof TokenCredentialUpdateRequestSchema
->;
-
-export const Ap2CompleteRequestObjectSchema = z.object({
-  checkout_mandate: z.string(),
-});
-export type Ap2CompleteRequestObject = z.infer<
-  typeof Ap2CompleteRequestObjectSchema
->;
-
-export const Ap2CheckoutResponseObjectSchema = z.object({
-  merchant_authorization: z.string(),
-});
-export type Ap2CheckoutResponseObject = z.infer<
-  typeof Ap2CheckoutResponseObjectSchema
->;
-
-export const ConsentSchema = z.object({
-  analytics: z.boolean().optional(),
-  marketing: z.boolean().optional(),
-  preferences: z.boolean().optional(),
-  sale_of_data: z.boolean().optional(),
-});
-export type Consent = z.infer<typeof ConsentSchema>;
-
-export const AllocationElementSchema = z.object({
-  amount: z.number(),
-  path: z.string(),
-});
-export type AllocationElement = z.infer<typeof AllocationElementSchema>;
-
-export const MethodElementSchema = z.object({
-  destinations: z.array(FulfillmentDestinationRequestElementSchema).optional(),
-  groups: z.array(GroupElementSchema).optional(),
-  line_item_ids: z.array(z.string()).optional(),
-  selected_destination_id: z.union([z.null(), z.string()]).optional(),
-  type: TypeElementSchema,
-});
-export type MethodElement = z.infer<typeof MethodElementSchema>;
-
-export const FulfillmentAvailableMethodResponseSchema = z.object({
-  description: z.string().optional(),
-  fulfillable_on: z.union([z.null(), z.string()]).optional(),
-  line_item_ids: z.array(z.string()),
-  type: TypeElementSchema,
-});
-export type FulfillmentAvailableMethodResponse = z.infer<
-  typeof FulfillmentAvailableMethodResponseSchema
->;
-
-export const FulfillmentDestinationResponseSchema = z.object({
-  address_country: z.string().optional(),
-  address_locality: z.string().optional(),
-  address_region: z.string().optional(),
-  extended_address: z.string().optional(),
-  first_name: z.string().optional(),
-  full_name: z.string().optional(),
-  last_name: z.string().optional(),
-  phone_number: z.string().optional(),
-  postal_code: z.string().optional(),
-  street_address: z.string().optional(),
-  id: z.string(),
-  address: PostalAddressSchema.optional(),
-  name: z.string().optional(),
-});
-export type FulfillmentDestinationResponse = z.infer<
-  typeof FulfillmentDestinationResponseSchema
->;
-
-export const FulfillmentGroupResponseSchema = z.object({
-  id: z.string(),
-  line_item_ids: z.array(z.string()),
-  options: z.array(FulfillmentOptionResponseSchema).optional(),
-  selected_option_id: z.union([z.null(), z.string()]).optional(),
-});
-export type FulfillmentGroupResponse = z.infer<
-  typeof FulfillmentGroupResponseSchema
->;
-
-export const PaymentSchema = z.object({
-  handlers: z.array(PaymentHandlerResponseSchema).optional(),
-});
-export type Payment = z.infer<typeof PaymentSchema>;
-
-export const UcpServiceSchema = z.object({
-  a2a: A2ASchema.optional(),
-  embedded: EmbeddedSchema.optional(),
-  mcp: McpSchema.optional(),
-  rest: RestSchema.optional(),
-  spec: z.string(),
-  version: z.string(),
-});
-export type UcpService = z.infer<typeof UcpServiceSchema>;
-
-export const LineItemCreateRequestSchema = z.object({
-  item: ItemCreateRequestSchema,
-  quantity: z.number(),
-});
-export type LineItemCreateRequest = z.infer<typeof LineItemCreateRequestSchema>;
-
-export const PaymentInstrumentSchema = z.object({
-  billing_address: PostalAddressSchema.optional(),
-  credential: PaymentCredentialSchema.optional(),
-  handler_id: z.string(),
-  id: z.string(),
-  type: CardPaymentInstrumentTypeSchema,
-  brand: z.string(),
-  expiry_month: z.number().optional(),
-  expiry_year: z.number().optional(),
-  last_digits: z.string(),
-  rich_card_art: z.string().optional(),
-  rich_text_description: z.string().optional(),
-});
-export type PaymentInstrument = z.infer<typeof PaymentInstrumentSchema>;
-
-export const LineItemResponseSchema = z.object({
-  id: z.string(),
-  item: ItemResponseSchema,
-  parent_id: z.string().optional(),
-  quantity: z.number(),
-  totals: z.array(TotalResponseSchema),
-});
-export type LineItemResponse = z.infer<typeof LineItemResponseSchema>;
-
-export const PaymentResponseSchema = z.object({
-  handlers: z.array(PaymentHandlerResponseSchema),
-  instruments: z.array(PaymentInstrumentSchema).optional(),
-  selected_instrument_id: z.string().optional(),
-});
-export type PaymentResponse = z.infer<typeof PaymentResponseSchema>;
-
-export const UcpCheckoutResponseSchema = z.object({
-  capabilities: z.array(CapabilityResponseSchema),
-  version: z.string(),
-});
-export type UcpCheckoutResponse = z.infer<typeof UcpCheckoutResponseSchema>;
-
-export const LineItemUpdateRequestSchema = z.object({
-  id: z.string().optional(),
-  item: ItemUpdateRequestSchema,
-  parent_id: z.string().optional(),
-  quantity: z.number(),
-});
-export type LineItemUpdateRequest = z.infer<typeof LineItemUpdateRequestSchema>;
-
-export const CheckoutUpdateRequestPaymentSchema = z.object({
-  instruments: z.array(PaymentInstrumentSchema).optional(),
-  selected_instrument_id: z.string().optional(),
-});
-export type CheckoutUpdateRequestPayment = z.infer<
-  typeof CheckoutUpdateRequestPaymentSchema
->;
-
-export const AdjustmentSchema = z.object({
-  amount: z.number().optional(),
-  description: z.string().optional(),
-  id: z.string(),
-  line_items: z.array(AdjustmentLineItemSchema).optional(),
-  occurred_at: z.coerce.date(),
-  status: AdjustmentStatusSchema,
-  type: z.string(),
-});
-export type Adjustment = z.infer<typeof AdjustmentSchema>;
-
-export const FulfillmentEventSchema = z.object({
-  carrier: z.string().optional(),
-  description: z.string().optional(),
-  id: z.string(),
-  line_items: z.array(FulfillmentEventLineItemSchema),
-  occurred_at: z.coerce.date(),
-  tracking_number: z.string().optional(),
-  tracking_url: z.string().optional(),
-  type: z.string(),
-});
-export type FulfillmentEvent = z.infer<typeof FulfillmentEventSchema>;
-
-export const ExpectationSchema = z.object({
-  description: z.string().optional(),
-  destination: PostalAddressSchema,
-  fulfillable_on: z.string().optional(),
-  id: z.string(),
-  line_items: z.array(ExpectationLineItemSchema),
-  method_type: MethodTypeSchema,
-});
-export type Expectation = z.infer<typeof ExpectationSchema>;
-
-export const OrderLineItemSchema = z.object({
-  id: z.string(),
-  item: ItemResponseSchema,
-  parent_id: z.string().optional(),
-  quantity: QuantitySchema,
-  status: OrderLineItemStatusSchema,
-  totals: z.array(TotalResponseSchema),
-});
-export type OrderLineItem = z.infer<typeof OrderLineItemSchema>;
-
-export const PaymentCreateRequestSchema = z.object({
-  instruments: z.array(PaymentInstrumentSchema).optional(),
-  selected_instrument_id: z.string().optional(),
-});
-export type PaymentCreateRequest = z.infer<typeof PaymentCreateRequestSchema>;
-
-export const PaymentDataSchema = z.object({
-  payment_data: PaymentInstrumentSchema,
-});
-export type PaymentData = z.infer<typeof PaymentDataSchema>;
-
-export const PaymentUpdateRequestSchema = z.object({
-  instruments: z.array(PaymentInstrumentSchema).optional(),
-  selected_instrument_id: z.string().optional(),
-});
-export type PaymentUpdateRequest = z.infer<typeof PaymentUpdateRequestSchema>;
-
-export const BindingSchema = z.object({
-  checkout_id: z.string(),
-  identity: IdentityClassSchema.optional(),
-});
-export type Binding = z.infer<typeof BindingSchema>;
-
-export const FulfillmentMethodCreateRequestSchema = z.object({
-  destinations: z.array(FulfillmentDestinationRequestElementSchema).optional(),
-  groups: z.array(GroupElementSchema).optional(),
-  line_item_ids: z.array(z.string()).optional(),
-  selected_destination_id: z.union([z.null(), z.string()]).optional(),
-  type: TypeElementSchema,
-});
-export type FulfillmentMethodCreateRequest = z.infer<
-  typeof FulfillmentMethodCreateRequestSchema
->;
-
-export const FulfillmentMethodUpdateRequestSchema = z.object({
-  destinations: z.array(FulfillmentDestinationRequestElementSchema).optional(),
-  groups: z.array(GroupClassSchema).optional(),
-  id: z.string(),
-  line_item_ids: z.array(z.string()),
-  selected_destination_id: z.union([z.null(), z.string()]).optional(),
-});
-export type FulfillmentMethodUpdateRequest = z.infer<
-  typeof FulfillmentMethodUpdateRequestSchema
->;
-
-export const MerchantFulfillmentConfigSchema = z.object({
-  allows_method_combinations: z.array(z.array(TypeElementSchema)).optional(),
-  allows_multi_destination: AllowsMultiDestinationSchema.optional(),
-});
-export type MerchantFulfillmentConfig = z.infer<
-  typeof MerchantFulfillmentConfigSchema
->;
-
-export const OrderFulfillmentDetailSchema = z.object({
-  expected_fulfillment_time: z.string().optional(),
-  fulfillment_address: PostalAddressSchema.optional(),
-  fulfillment_option: FulfillmentOptionResponseSchema,
-  fulfillment_tracking_url: z.string().optional(),
-  id: z.string(),
-  status: OrderFulfillmentDetailStatusSchema,
-  tracking_identifier: z.string().optional(),
-});
-export type OrderFulfillmentDetail = z.infer<
-  typeof OrderFulfillmentDetailSchema
->;
-
-export const CompleteCheckoutRequestWithAp2Schema = z.object({
-  ap2: Ap2CompleteRequestObjectSchema.optional(),
-});
-export type CompleteCheckoutRequestWithAp2 = z.infer<
-  typeof CompleteCheckoutRequestWithAp2Schema
->;
-
-export const CheckoutWithAp2MandateSchema = z.object({
-  buyer: BuyerSchema.optional(),
-  continue_url: z.string().optional(),
-  currency: z.string(),
-  expires_at: z.coerce.date().optional(),
-  id: z.string(),
-  line_items: z.array(LineItemResponseSchema),
-  links: z.array(LinkSchema),
-  messages: z.array(MessageSchema).optional(),
-  order_id: z.string().optional(),
-  order_permalink_url: z.string().optional(),
-  payment: PaymentResponseSchema,
-  status: CheckoutResponseStatusSchema,
-  totals: z.array(TotalResponseSchema),
-  ucp: UcpCheckoutResponseSchema,
-  ap2: Ap2CheckoutResponseObjectSchema.optional(),
-});
-export type CheckoutWithAp2Mandate = z.infer<
-  typeof CheckoutWithAp2MandateSchema
->;
-
-export const BuyerWithConsentSchema = z.object({
-  email: z.string().optional(),
-  first_name: z.string().optional(),
-  full_name: z.string().optional(),
-  last_name: z.string().optional(),
-  phone_number: z.string().optional(),
-  consent: ConsentSchema.optional(),
-});
-export type BuyerWithConsent = z.infer<typeof BuyerWithConsentSchema>;
-
-export const AppliedElementSchema = z.object({
-  allocations: z.array(AllocationElementSchema).optional(),
-  amount: z.number(),
-  automatic: z.boolean().optional(),
-  code: z.string().optional(),
-  method: MethodSchema.optional(),
-  priority: z.number().optional(),
-  title: z.string(),
-});
-export type AppliedElement = z.infer<typeof AppliedElementSchema>;
-
-export const FulfillmentRequestSchema = z.object({
-  methods: z.array(MethodElementSchema).optional(),
-});
-export type FulfillmentRequest = z.infer<typeof FulfillmentRequestSchema>;
-
-export const CheckoutWithFulfillmentUpdateRequestSchema = z.object({
-  buyer: BuyerSchema.optional(),
-  currency: z.string(),
-  id: z.string(),
-  line_items: z.array(LineItemUpdateRequestSchema),
-  payment: CheckoutUpdateRequestPaymentSchema,
-  fulfillment: FulfillmentRequestSchema.optional(),
-});
-export type CheckoutWithFulfillmentUpdateRequest = z.infer<
-  typeof CheckoutWithFulfillmentUpdateRequestSchema
->;
-
-export const FulfillmentMethodResponseSchema = z.object({
-  destinations: z.array(FulfillmentDestinationResponseSchema).optional(),
-  groups: z.array(FulfillmentGroupResponseSchema).optional(),
-  id: z.string(),
-  line_item_ids: z.array(z.string()),
-  selected_destination_id: z.union([z.null(), z.string()]).optional(),
-  type: TypeElementSchema,
-});
-export type FulfillmentMethodResponse = z.infer<
-  typeof FulfillmentMethodResponseSchema
->;
-
-export const UcpClassSchema = z.object({
-  capabilities: z.array(CapabilityDiscoverySchema),
-  services: z.record(z.string(), UcpServiceSchema),
-  version: z.string(),
-});
-export type UcpClass = z.infer<typeof UcpClassSchema>;
-
-export const PaymentClassSchema = z.object({
-  instruments: z.array(PaymentInstrumentSchema).optional(),
-  selected_instrument_id: z.string().optional(),
-});
-export type PaymentClass = z.infer<typeof PaymentClassSchema>;
-
-export const CheckoutResponseSchema = z.object({
-  buyer: BuyerSchema.optional(),
-  continue_url: z.string().optional(),
-  currency: z.string(),
-  expires_at: z.coerce.date().optional(),
-  id: z.string(),
-  line_items: z.array(LineItemResponseSchema),
-  links: z.array(LinkSchema),
-  messages: z.array(MessageSchema).optional(),
-  order_id: z.string().optional(),
-  order_permalink_url: z.string().optional(),
-  payment: PaymentResponseSchema,
-  status: CheckoutResponseStatusSchema,
-  totals: z.array(TotalResponseSchema),
-  ucp: UcpCheckoutResponseSchema,
-});
-export type CheckoutResponse = z.infer<typeof CheckoutResponseSchema>;
-
-export const CheckoutUpdateRequestSchema = z.object({
-  buyer: BuyerSchema.optional(),
-  currency: z.string(),
-  id: z.string(),
-  line_items: z.array(LineItemUpdateRequestSchema),
-  payment: CheckoutUpdateRequestPaymentSchema,
-});
-export type CheckoutUpdateRequest = z.infer<typeof CheckoutUpdateRequestSchema>;
-
-export const FulfillmentSchema = z.object({
-  events: z.array(FulfillmentEventSchema).optional(),
-  expectations: z.array(ExpectationSchema).optional(),
-});
-export type Fulfillment = z.infer<typeof FulfillmentSchema>;
-
-export const CheckoutWithBuyerConsentSchema = z.object({
-  buyer: BuyerWithConsentSchema.optional(),
-  continue_url: z.string().optional(),
-  currency: z.string(),
-  expires_at: z.coerce.date().optional(),
-  id: z.string(),
-  line_items: z.array(LineItemResponseSchema),
-  links: z.array(LinkSchema),
-  messages: z.array(MessageSchema).optional(),
-  order_id: z.string().optional(),
-  order_permalink_url: z.string().optional(),
-  payment: PaymentResponseSchema,
-  status: CheckoutResponseStatusSchema,
-  totals: z.array(TotalResponseSchema),
-  ucp: UcpCheckoutResponseSchema,
-});
-export type CheckoutWithBuyerConsent = z.infer<
-  typeof CheckoutWithBuyerConsentSchema
->;
-
-export const DiscountsClassSchema = z.object({
-  applied: z.array(AppliedElementSchema).optional(),
-  codes: z.array(z.string()).optional(),
-});
-export type DiscountsClass = z.infer<typeof DiscountsClassSchema>;
-
-export const CheckoutWithFulfillmentCreateRequestSchema = z.object({
-  buyer: BuyerSchema.optional(),
-  currency: z.string(),
-  line_items: z.array(LineItemCreateRequestSchema),
-  payment: PaymentClassSchema,
-  fulfillment: FulfillmentRequestSchema.optional(),
-});
-export type CheckoutWithFulfillmentCreateRequest = z.infer<
-  typeof CheckoutWithFulfillmentCreateRequestSchema
->;
-
-export const FulfillmentResponseSchema = z.object({
-  available_methods: z
-    .array(FulfillmentAvailableMethodResponseSchema)
-    .optional(),
-  methods: z.array(FulfillmentMethodResponseSchema).optional(),
-});
-export type FulfillmentResponse = z.infer<typeof FulfillmentResponseSchema>;
-
-export const UcpDiscoveryProfileSchema = z.object({
-  payment: PaymentSchema.optional(),
-  signing_keys: z.array(SigningKeySchema).optional(),
-  ucp: UcpClassSchema,
-});
-export type UcpDiscoveryProfile = z.infer<typeof UcpDiscoveryProfileSchema>;
-
-export const CheckoutCreateRequestSchema = z.object({
-  buyer: BuyerSchema.optional(),
-  currency: z.string(),
-  line_items: z.array(LineItemCreateRequestSchema),
-  payment: PaymentClassSchema,
-});
-export type CheckoutCreateRequest = z.infer<typeof CheckoutCreateRequestSchema>;
-
-export const OrderSchema = z.object({
-  adjustments: z.array(AdjustmentSchema).optional(),
-  checkout_id: z.string(),
-  fulfillment: FulfillmentSchema,
-  id: z.string(),
-  line_items: z.array(OrderLineItemSchema),
-  permalink_url: z.string(),
-  totals: z.array(TotalResponseSchema),
-  ucp: UcpOrderResponseSchema,
-});
-export type Order = z.infer<typeof OrderSchema>;
-
-export const CheckoutWithDiscountSchema = z.object({
-  buyer: BuyerSchema.optional(),
-  continue_url: z.string().optional(),
-  currency: z.string(),
-  expires_at: z.coerce.date().optional(),
-  id: z.string(),
-  line_items: z.array(LineItemResponseSchema),
-  links: z.array(LinkSchema),
-  messages: z.array(MessageSchema).optional(),
-  order_id: z.string().optional(),
-  order_permalink_url: z.string().optional(),
-  payment: PaymentResponseSchema,
-  status: CheckoutResponseStatusSchema,
-  totals: z.array(TotalResponseSchema),
-  ucp: UcpCheckoutResponseSchema,
-  discounts: DiscountsClassSchema.optional(),
-});
-export type CheckoutWithDiscount = z.infer<typeof CheckoutWithDiscountSchema>;
-
-export const CheckoutWithFulfillmentResponseSchema = z.object({
-  buyer: BuyerSchema.optional(),
-  continue_url: z.string().optional(),
-  currency: z.string(),
-  expires_at: z.coerce.date().optional(),
-  id: z.string(),
-  line_items: z.array(LineItemResponseSchema),
-  links: z.array(LinkSchema),
-  messages: z.array(MessageSchema).optional(),
-  order_id: z.string().optional(),
-  order_permalink_url: z.string().optional(),
-  payment: PaymentResponseSchema,
-  status: CheckoutResponseStatusSchema,
-  totals: z.array(TotalResponseSchema),
-  ucp: UcpCheckoutResponseSchema,
-  fulfillment: FulfillmentResponseSchema.optional(),
-});
-export type CheckoutWithFulfillmentResponse = z.infer<
-  typeof CheckoutWithFulfillmentResponseSchema
->;
diff --git a/rest/nodejs/src/utils/config.ts b/rest/nodejs/src/utils/config.ts
new file mode 100644
index 00000000..65444aca
--- /dev/null
+++ b/rest/nodejs/src/utils/config.ts
@@ -0,0 +1 @@
+export const UCP_VERSION = "2026-04-08";
diff --git a/rest/nodejs/src/utils/validation.ts b/rest/nodejs/src/utils/validation.ts
index 7a625b49..7d82a632 100644
--- a/rest/nodejs/src/utils/validation.ts
+++ b/rest/nodejs/src/utils/validation.ts
@@ -9,9 +9,19 @@ import * as z from "zod";
  * @param c - The Hono context.
  * @returns A response object if validation fails, otherwise void (implied continuation).
  */
+const formatPath = (path: (string | number)[]) => {
+  return path.reduce((acc, val) => {
+    if (typeof val === "number") {
+      return `${acc}[${val}]`;
+    }
+    return acc ? `${acc}.${val}` : String(val);
+  }, "");
+};
+
 export function prettyValidation<T>(
   result:
-    { success: true; data: T; target: string } | { success: false; error: any },
+    | { success: true; data: T; target: string }
+    | { success: false; error: z.ZodError },
   c: Context
 ) {
   if (result.success) {
@@ -23,7 +33,12 @@ export function prettyValidation<T>(
     c.var.logger.warn(
       `Request payload:\n${JSON.stringify(c.req.json(), null, 2)}`
     );
-    const prettyError = z.prettifyError(result.error);
+    const prettyError = result.error.issues
+      .map((issue) => {
+        const path = formatPath(issue.path);
+        return `✖ ${issue.message}\n  → at ${path}`;
+      })
+      .join("\n");
 
     c.var.logger.warn(prettyError);
     return c.text(prettyError, 422);