Request Postal Mailing for Tax Form

This POST endpoint is used to enable postal mailing for a tax form (1099-K, 1099-NEC, or 1099-MISC) that has already been transmitted to the IRS. The form is identified by its submission_id, and the form type is detected automatically. A $1.80 USD postal mailing fee is charged per successful request, and postal mailing can be requested multiple times for the same submission (e.g., for re-prints) — each request incurs the fee. Postal orders can only be created for forms that have been transmitted — for forms not yet transmitted, set is_postal: true on the update (PUT) endpoint instead.
To use this endpoint, you need to provide the user_token as a parameter in the URL Path and the submission_id in the request body.