Changes to Create Message

added the optional property code to the response with the 422 status

request property container list-of-types was widened by adding types object to media type application/json

request property container list-of-types was narrowed by removing types object from media type application/json

deleted the header request parameter Idempotency-Key

added the new optional header request parameter Idempotency-Key

request property container list-of-types was widened by adding types object to media type application/json

api operation id create_message_api_v1_messages_post removed and replaced with messages-create_message

endpoint added