diff --git a/CHANGELOG.md b/CHANGELOG.md
index e98aad9..7abd266 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,19 @@ All notable changes to the Smile Identity API specifications will be documented
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
 ## [Unreleased]
+
+## [v3.635.0] - 2026-06-04
+
+### Changed
+- Updated `v3-biometric-authentication-entry`
+- Updated `v3-biometric-enrollment-entry`
+- Updated `v3-biometric-kyc-entry`
+- Updated `v3-document-verification-entry`
+- Updated `v3-enhanced-document-verification-entry`
+- Updated `v3-enhanced-kyc-entry`
+- Updated `v3-report-user-fraud`
+- Updated `v3-smart-selfie-compare-entry`
+
 ## [v3.634.0] - 2026-06-04
 
 ### Changed
diff --git a/specs/v3/v3-biometric-authentication-entry.yaml b/specs/v3/v3-biometric-authentication-entry.yaml
index 46ef80d..0ef895a 100644
--- a/specs/v3/v3-biometric-authentication-entry.yaml
+++ b/specs/v3/v3-biometric-authentication-entry.yaml
@@ -99,6 +99,11 @@ paths:
               schema:
                 $ref: '#/components/schemas/ErrorResponse'
               examples:
+                missingCallbackUrl:
+                  summary: Missing callback_url and no default set
+                  value:
+                    status: Bad Request
+                    message: A valid callback_url is required in the request or a default callback URL must be configured in the portal.
                 missingUserId:
                   summary: Missing user_id
                   value:
diff --git a/specs/v3/v3-biometric-enrollment-entry.yaml b/specs/v3/v3-biometric-enrollment-entry.yaml
index 7798f16..cdfee54 100644
--- a/specs/v3/v3-biometric-enrollment-entry.yaml
+++ b/specs/v3/v3-biometric-enrollment-entry.yaml
@@ -111,6 +111,11 @@ paths:
                   value:
                     status: Bad Request
                     message: liveness_images must contain at least 6 images.
+                missingCallbackUrl:
+                  summary: Missing callback_url and no default set
+                  value:
+                    status: Bad Request
+                    message: A valid callback_url is required in the request or a default callback URL must be configured in the portal.
                 missingContact:
                   summary: Missing email and phone
                   value:
diff --git a/specs/v3/v3-biometric-kyc-entry.yaml b/specs/v3/v3-biometric-kyc-entry.yaml
index 4fa4ecc..fc2ca0e 100644
--- a/specs/v3/v3-biometric-kyc-entry.yaml
+++ b/specs/v3/v3-biometric-kyc-entry.yaml
@@ -120,6 +120,11 @@ paths:
                   value:
                     status: Bad Request
                     message: liveness_images must contain at least 6 images.
+                missingCallbackUrl:
+                  summary: Missing callback_url and no default set
+                  value:
+                    status: Bad Request
+                    message: A valid callback_url is required in the request or a default callback URL must be configured in the portal.
                 missingCountry:
                   summary: Missing required field
                   value:
diff --git a/specs/v3/v3-document-verification-entry.yaml b/specs/v3/v3-document-verification-entry.yaml
index b35aae2..cc7bf34 100644
--- a/specs/v3/v3-document-verification-entry.yaml
+++ b/specs/v3/v3-document-verification-entry.yaml
@@ -130,6 +130,11 @@ paths:
                   value:
                     status: Bad Request
                     message: liveness_images must contain at least 6 images.
+                missingCallbackUrl:
+                  summary: Missing callback_url and no default set
+                  value:
+                    status: Bad Request
+                    message: A valid callback_url is required in the request or a default callback URL must be configured in the portal.
                 missingCountry:
                   summary: Missing required field
                   value:
diff --git a/specs/v3/v3-enhanced-document-verification-entry.yaml b/specs/v3/v3-enhanced-document-verification-entry.yaml
index f7031e8..cecfecf 100644
--- a/specs/v3/v3-enhanced-document-verification-entry.yaml
+++ b/specs/v3/v3-enhanced-document-verification-entry.yaml
@@ -135,6 +135,11 @@ paths:
                   value:
                     status: Bad Request
                     message: liveness_images must contain at least 6 images.
+                missingCallbackUrl:
+                  summary: Missing callback_url and no default set
+                  value:
+                    status: Bad Request
+                    message: A valid callback_url is required in the request or a default callback URL must be configured in the portal.
                 missingCountry:
                   summary: Missing required field
                   value:
diff --git a/specs/v3/v3-enhanced-kyc-entry.yaml b/specs/v3/v3-enhanced-kyc-entry.yaml
index e3e4c1d..94648b2 100644
--- a/specs/v3/v3-enhanced-kyc-entry.yaml
+++ b/specs/v3/v3-enhanced-kyc-entry.yaml
@@ -97,6 +97,11 @@ paths:
                   value:
                     status: Bad Request
                     message: "Required field 'country' is missing or invalid."
+                missingCallbackUrl:
+                  summary: Missing callback_url and no default set
+                  value:
+                    status: Bad Request
+                    message: A valid callback_url is required in the request or a default callback URL must be configured in the portal.
                 missingContact:
                   summary: Missing email and phone
                   value:
diff --git a/specs/v3/v3-smart-selfie-compare-entry.yaml b/specs/v3/v3-smart-selfie-compare-entry.yaml
index b66e1b1..edef7f2 100644
--- a/specs/v3/v3-smart-selfie-compare-entry.yaml
+++ b/specs/v3/v3-smart-selfie-compare-entry.yaml
@@ -99,6 +99,11 @@ paths:
               schema:
                 $ref: '#/components/schemas/ErrorResponse'
               examples:
+                missingCallbackUrl:
+                  summary: Missing callback_url and no default set
+                  value:
+                    status: Bad Request
+                    message: A valid callback_url is required in the request or a default callback URL must be configured in the portal.
                 missingSelfie:
                   summary: Missing selfie image
                   value: