Changes to Create a sender registration

added GatewayAuthStatus UpstreamUnavailableErrorResponse to the response body oneOf list for the response status 503

the response's body type changed from object to no type for status 503

removed the required property status from the response with the 503 status

added the new SUBMITTED_TO_REGISTRY enum value to the allOf[subschema #2]/data/status response property for the response status 201

added the new optional request property account_id

request property child_account_id deprecated

added the non-success response with the status 403

added the non-success response with the status 404

response property allOf[subschema #2]/data/child_account_id deprecated

added the required property allOf[subschema #2]/data/account_id to the response with the 201 status

the response's body type changed from no type to object for status 401

removed CommonErrorResponse subschema #2 from the response body allOf list for the response status 401

added the non-success response with the status 503

added the required property status to the response with the 401 status

added the new ALPHANUMERIC enum value to the allOf[subschema #2]/data/type response property for the response status 201

added the optional property allOf[subschema #2]/data/details to the response with the 201 status