diff --git a/v0/catalog/knowyourcustomer/kyc_match_openapi.yaml b/v0/catalog/knowyourcustomer/kyc_match_openapi.yaml
index 45247d4..cc019ef 100644
--- a/v0/catalog/knowyourcustomer/kyc_match_openapi.yaml
+++ b/v0/catalog/knowyourcustomer/kyc_match_openapi.yaml
@@ -39,6 +39,13 @@ paths:
         Create an app on our [Sandbox](/docs/sandbox) to get credentials and [retrieve tokens](/reference/authorize) so you can perform API calls to our operators' production environments, or use the following convenience token to test in mock mode:
         
         `mock_sandbox_access_token`
+
+        ## Mock Mode Technical Specification
+
+        When testing in mock mode, the following rules apply based on the input:
+
+        - If the input is invalid → the response is 400 Bad Request with details of the invalid field.
+        - If the input is valid → the response is 200 OK with `match: true/false` and `matchScore` between 0 and 100 for some keys.
       operationId: KYC_Match_v0.2
 
       security:
diff --git a/v0/catalog/numberverification/numberverification_openapi.yaml b/v0/catalog/numberverification/numberverification_openapi.yaml
index 19f8f52..768bd2b 100644
--- a/v0/catalog/numberverification/numberverification_openapi.yaml
+++ b/v0/catalog/numberverification/numberverification_openapi.yaml
@@ -59,6 +59,14 @@ paths:
         
         `mock_sandbox_access_token`
 
+        ## Mock Mode Technical Specification
+
+        When testing in mock mode, the following rules apply based on the phone number:
+
+        - If `phoneNumber` ends with 1 → the response is 200 OK with `devicePhoneNumberVerified: true`.
+        - If `phoneNumber` ends with 2 → the response is 200 OK with `devicePhoneNumberVerified: false`.
+        - If `phoneNumber` ends with 3-0 → the response is 200 OK and `devicePhoneNumberVerified` will be true or false depending on whether the current timestamp is even or odd.
+
         You can explore our [Number Verification sample code](/docs/samplecode_numberverification) for additional guidance on using this API.
       operationId: phoneNumberVerify
       requestBody:
diff --git a/v0/catalog/simswap/simswap_openapi.yaml b/v0/catalog/simswap/simswap_openapi.yaml
index c06cfd3..c706114 100644
--- a/v0/catalog/simswap/simswap_openapi.yaml
+++ b/v0/catalog/simswap/simswap_openapi.yaml
@@ -50,6 +50,16 @@ paths:
         
         `mock_sandbox_access_token`
 
+        ## Mock Mode Technical Specification
+
+        When testing in mock mode, the following rules apply based on the phone number:
+
+        - If `phoneNumber` ends with 1 → the response is 200 OK with `simSwapped: true`.
+        - If `phoneNumber` ends with 2 → the response is 200 OK with `simSwapped: false`.
+        - If `phoneNumber` ends with 3-0 → the response is 200 OK and `simSwapped` will be true or false depending on whether the current timestamp is even or odd.
+        - When retrieving swap date: if `phoneNumber` ends with 9 → the response is 409 Conflict with message: "Another request is created for the same phone number".
+        - When retrieving swap date: if `phoneNumber` ends with 0-8 → the response is 200 OK with `latestSimChange` timestamp.
+
         You can explore our [SIM Swap sample code](/docs/samplecode_simswap) for additional guidance on using this API.
       operationId: checkSimSwap
       requestBody:
@@ -102,6 +112,16 @@ paths:
         
         `mock_sandbox_access_token`
 
+        ## Mock Mode Technical Specification
+
+        When testing in mock mode, the following rules apply based on the phone number:
+
+        - If `phoneNumber` ends with 1 → the response is 200 OK with `simSwapped: true`.
+        - If `phoneNumber` ends with 2 → the response is 200 OK with `simSwapped: false`.
+        - If `phoneNumber` ends with 3-0 → the response is 200 OK and `simSwapped` will be true or false depending on whether the current timestamp is even or odd.
+        - When retrieving swap date: if `phoneNumber` ends with 9 → the response is 409 Conflict with message: "Another request is created for the same phone number".
+        - When retrieving swap date: if `phoneNumber` ends with 0-8 → the response is 200 OK with `latestSimChange` timestamp.
+
         You can explore our [SIM Swap sample code](/docs/samplecode_simswap) for additional guidance on using this API.
       operationId: retrieveSimSwapDate
       requestBody: