diff --git a/src/app/(mobile-ui)/qr-pay/__tests__/qr-pay-states.test.tsx b/src/app/(mobile-ui)/qr-pay/__tests__/qr-pay-states.test.tsx
index d2c45a152..c0f6f3e7c 100644
--- a/src/app/(mobile-ui)/qr-pay/__tests__/qr-pay-states.test.tsx
+++ b/src/app/(mobile-ui)/qr-pay/__tests__/qr-pay-states.test.tsx
@@ -1052,6 +1052,31 @@ describe('GROUP 4: Success States', () => {
         expect(screen.getByText('Split this bill')).toBeInTheDocument()
     })
 
+    test('See receipt opens the drawer keyed by the Manteca synthetic id, not externalId', async () => {
+        // getReceiptUrl builds /receipt/<id>?kind=QR_PAY, and the backend resolves
+        // that id only via the Manteca synthetic id. Stamping externalId here 404s
+        // every shared receipt.
+        const openTransactionDetails = jest.fn()
+        mockUseTransactionDetailsDrawer.mockReturnValue({
+            openTransactionDetails,
+            selectedTransaction: null,
+            isDrawerOpen: false,
+            closeTransactionDetails: jest.fn(),
+        })
+
+        await completeMantecaPayment()
+
+        await waitFor(() => {
+            expect(screen.getByText('See receipt')).toBeInTheDocument()
+        })
+
+        await act(async () => {
+            fireEvent.click(screen.getByText('See receipt'))
+        })
+
+        expect(openTransactionDetails).toHaveBeenCalledWith(expect.objectContaining({ id: 'qp1' }))
+    })
+
     test('Manteca success, perk eligible shows hold-to-claim button', async () => {
         await completeMantecaPayment({
             perk: {
diff --git a/src/app/(mobile-ui)/qr-pay/page.tsx b/src/app/(mobile-ui)/qr-pay/page.tsx
index 9aef2fb13..c3066e7e5 100644
--- a/src/app/(mobile-ui)/qr-pay/page.tsx
+++ b/src/app/(mobile-ui)/qr-pay/page.tsx
@@ -1440,7 +1440,11 @@ export default function QRPayPage() {
                                     onClick={() => {
                                         const now = new Date()
                                         openTransactionDetails({
-                                            id: qrPayment!.externalId,
+                                            // Manteca synthetic id — the only key /receipt/<id>
+                                            // resolves, and what Activity rows already carry.
+                                            // `externalId` is UUID-shaped, so it slips past the
+                                            // id-shape gate and 404s silently instead of erroring.
+                                            id: qrPayment!.id,
                                             direction: 'qr_payment',
                                             userName: qrPayment!.details.merchant.name,
                                             fullName: qrPayment!.details.merchant.name,