Status 400 Bad Request returned by ServiceNow Table API via Genesys Cloud Data Action when triggered by SMS conversation start. Payload validated against SNOW docs; fields map correctly. Tested via Postman with identical JSON structure-successful creation. Verified webhook signature and OAuth token validity. Architect flow uses ‘Create ServiceNow Record’ action with static mapping. No logs in ServiceNow indicating schema mismatch. Is there a specific header requirement for digital channel triggers that differs from manual webhook invocations?