diff --git a/src/main/kotlin/com/cloudcontactai/sdk/ExampleRunner.kt b/src/main/kotlin/com/cloudcontactai/sdk/ExampleRunner.kt
index 7836e1e..eeda44a 100644
--- a/src/main/kotlin/com/cloudcontactai/sdk/ExampleRunner.kt
+++ b/src/main/kotlin/com/cloudcontactai/sdk/ExampleRunner.kt
@@ -23,7 +23,7 @@ fun main() {
             message = "Hello John, this is a test message from CCAI SDK!",
             title = "Test SMS Campaign"
         )
-        println("SMS sent with ID: ${smsResponse.id}")
+        println("SMS sent with response ID:${smsResponse.responseId} and campaign ID: ${smsResponse.id}")
         
         println("\n=== Email Examples ===")
         
@@ -43,7 +43,7 @@ fun main() {
             """.trimIndent(),
             textContent = null
         )
-        println("Email sent with ID: ${emailResponse.id}")
+        println("Email sent with response ID:${emailResponse.responseId} and campaign ID: ${emailResponse.id}")
         
         println("\n=== MMS Examples ===")
         
@@ -60,8 +60,7 @@ fun main() {
                 imageFile = imageFile,
                 senderPhone = null
             )
-            val responseId = mmsResponse.campaignId ?: mmsResponse.id
-            println("MMS sent with ID: $responseId")
+            println("MMS sent with response ID:${mmsResponse.responseId} and campaign ID: ${mmsResponse.id}")
         } else {
             println("Skipping MMS example - test-image.jpg not found")
         }
diff --git a/src/main/kotlin/com/cloudcontactai/sdk/email/EmailModels.kt b/src/main/kotlin/com/cloudcontactai/sdk/email/EmailModels.kt
index f01a297..e58be71 100644
--- a/src/main/kotlin/com/cloudcontactai/sdk/email/EmailModels.kt
+++ b/src/main/kotlin/com/cloudcontactai/sdk/email/EmailModels.kt
@@ -33,7 +33,8 @@ data class EmailResponse(
     @JsonProperty("id") val id: String,
     @JsonProperty("campaignId") val campaignId: String? = null,
     @JsonProperty("status") val status: String,
-    @JsonProperty("message") val message: String? = null
+    @JsonProperty("message") val message: String? = null,
+    @JsonProperty("responseId") val responseId: String? = null
 )
 
 @JsonIgnoreProperties(ignoreUnknown = true)
diff --git a/src/main/kotlin/com/cloudcontactai/sdk/mms/MMSModels.kt b/src/main/kotlin/com/cloudcontactai/sdk/mms/MMSModels.kt
index 0767289..13b5cb5 100644
--- a/src/main/kotlin/com/cloudcontactai/sdk/mms/MMSModels.kt
+++ b/src/main/kotlin/com/cloudcontactai/sdk/mms/MMSModels.kt
@@ -27,7 +27,8 @@ data class MMSResponse(
     val timestamp: String? = null,
     val cost: Double? = null,
     val errorCode: String? = null,
-    val id: String? = null
+    val id: String? = null,
+    val responseId: String? = null
 )
 
 data class SignedUploadUrlRequest(
diff --git a/src/main/kotlin/com/cloudcontactai/sdk/sms/SMSModels.kt b/src/main/kotlin/com/cloudcontactai/sdk/sms/SMSModels.kt
index 2fe0b14..20b0b89 100644
--- a/src/main/kotlin/com/cloudcontactai/sdk/sms/SMSModels.kt
+++ b/src/main/kotlin/com/cloudcontactai/sdk/sms/SMSModels.kt
@@ -24,7 +24,8 @@ data class SMSResponse(
     @JsonProperty("id") val id: String,
     @JsonProperty("campaignId") val campaignId: String? = null,
     @JsonProperty("status") val status: String? = null,
-    @JsonProperty("message") val message: String? = null
+    @JsonProperty("message") val message: String? = null,
+    @JsonProperty("responseId") val responseId: String? = null
 )
 
 @JsonIgnoreProperties(ignoreUnknown = true)
diff --git a/src/test/kotlin/com/cloudcontactai/sdk/email/EmailServiceTest.kt b/src/test/kotlin/com/cloudcontactai/sdk/email/EmailServiceTest.kt
index 13ccf62..189f839 100644
--- a/src/test/kotlin/com/cloudcontactai/sdk/email/EmailServiceTest.kt
+++ b/src/test/kotlin/com/cloudcontactai/sdk/email/EmailServiceTest.kt
@@ -44,7 +44,8 @@ class EmailServiceTest {
                 "id": "email-123",
                 "campaignId": "campaign-123",
                 "status": "sent",
-                "message": "Email sent successfully"
+                "message": "Email sent successfully",
+                "responseId": "resp-email-123"
             }
         """.trimIndent()
         
@@ -63,6 +64,7 @@ class EmailServiceTest {
         
         assertEquals("email-123", response.id)
         assertEquals("sent", response.status)
+        assertEquals("resp-email-123", response.responseId)
     }
     
     @Test
@@ -72,7 +74,8 @@ class EmailServiceTest {
                 "id": "email-456",
                 "campaignId": "campaign-456",
                 "status": "sent",
-                "message": "Emails sent successfully"
+                "message": "Emails sent successfully",
+                "responseId": "resp-email-456"
             }
         """.trimIndent()
         
@@ -94,6 +97,7 @@ class EmailServiceTest {
         
         assertEquals("email-456", response.id)
         assertEquals("sent", response.status)
+        assertEquals("resp-email-456", response.responseId)
     }
     
     @Test
diff --git a/src/test/kotlin/com/cloudcontactai/sdk/mms/MMSServiceTest.kt b/src/test/kotlin/com/cloudcontactai/sdk/mms/MMSServiceTest.kt
index aa33fcc..878da6e 100644
--- a/src/test/kotlin/com/cloudcontactai/sdk/mms/MMSServiceTest.kt
+++ b/src/test/kotlin/com/cloudcontactai/sdk/mms/MMSServiceTest.kt
@@ -76,7 +76,8 @@ class MMSServiceTest {
                 "failedNumbers": null,
                 "timestamp": "2026-02-02T22:00:00Z",
                 "cost": 0.05,
-                "errorCode": null
+                "errorCode": null,
+                "responseId": "resp-mms-123"
             }
         """.trimIndent()
         
@@ -99,6 +100,7 @@ class MMSServiceTest {
         assertEquals("mms-campaign-123", response.campaignId)
         assertEquals(1, response.sentCount)
         assertTrue(response.success == true)
+        assertEquals("resp-mms-123", response.responseId)
     }
     
     @Test
@@ -113,7 +115,8 @@ class MMSServiceTest {
                 "failedNumbers": null,
                 "timestamp": "2026-02-02T22:00:00Z",
                 "cost": 0.05,
-                "errorCode": null
+                "errorCode": null,
+                "responseId": "resp-mms-single-123"
             }
         """.trimIndent()
         
@@ -133,6 +136,7 @@ class MMSServiceTest {
         
         assertEquals("mms-single-123", response.campaignId)
         assertTrue(response.success == true)
+        assertEquals("resp-mms-single-123", response.responseId)
     }
     
     @Test
diff --git a/src/test/kotlin/com/cloudcontactai/sdk/sms/SMSServiceTest.kt b/src/test/kotlin/com/cloudcontactai/sdk/sms/SMSServiceTest.kt
index 2a63e8d..51d08f1 100644
--- a/src/test/kotlin/com/cloudcontactai/sdk/sms/SMSServiceTest.kt
+++ b/src/test/kotlin/com/cloudcontactai/sdk/sms/SMSServiceTest.kt
@@ -44,7 +44,8 @@ class SMSServiceTest {
                 "id": "msg-123",
                 "campaignId": "campaign-123",
                 "status": "sent",
-                "message": "SMS sent successfully"
+                "message": "SMS sent successfully",
+                "responseId": "resp-123"
             }
         """.trimIndent()
         
@@ -64,6 +65,7 @@ class SMSServiceTest {
         assertEquals("campaign-123", response.campaignId)
         assertEquals("msg-123", response.id)
         assertEquals("sent", response.status)
+        assertEquals("resp-123", response.responseId)
     }
     
     @Test
@@ -73,7 +75,8 @@ class SMSServiceTest {
                 "id": "msg-456",
                 "campaignId": "campaign-456",
                 "status": "sent",
-                "message": "Bulk SMS sent successfully"
+                "message": "Bulk SMS sent successfully",
+                "responseId": "resp-456"
             }
         """.trimIndent()
         
@@ -95,6 +98,7 @@ class SMSServiceTest {
         
         assertEquals("campaign-456", response.campaignId)
         assertEquals("msg-456", response.id)
+        assertEquals("resp-456", response.responseId)
     }
     
     @Test