The Status Resource provides detailed information for failures via a list of status-failure type which contains:

• id - The identifier of the object that failed to be created. For STIX objects the id MUST be the STIX Object id. For object types that do not have their own identifier, the server MAY use any value as the id.
• message - A message indicating why the object failed to be created.

While the successes and pending statuses only contain a list of stings:

• string - For STIX objects the STIX ID MUST be used here. For object types that do not have their own identifier, the server MAY use any value as the id.

successes and pending should include the ability to provide a message.

Options:

Backward Compatible - expand the Status Response to include two optional keys (pending_responses and success_responses) which will contain a list of status-failure to provide detailed information for successes and pending statuses.

• the next major version of TAXII will implement this change and depreciate the list of strings

Non-Backward Compatible - update the current successes and pending to use status-failure.