This POST endpoint is used to transmit a Form 1099-NEC to the IRS for a specific user identified by their user_token. Once transmitted, the form cannot be edited or deleted. If no submission_id is provided in the request body, the latest untransmitted 1099-NEC form for the user will be automatically selected and transmitted.
To use this endpoint, you need to provide the user_token as a parameter in the URL Path. The submission_id in the request body is optional.