Changes to Create a Card for a User

added validation_error card_authorization_error to the response body oneOf list for the response status 400

the response's body type changed from object to no type for status 400

removed the optional property description from the response with the 400 status

removed the optional property status_code from the response with the 400 status

added the new optional header request parameter Idempotency-Key

added the non-success response with the status 409

added the non-success response with the status 422

added the non-success response with the status 429

added the non-success response with the status 503