Register the domain emails should come from and get its verification checks. Use this once when setting up white-label email. If the same sender (email and tracking_domain) is already fully verified, only its name is updated and status is already_verified.

Prerequisites: a bearer token, the account's id (company_id), and a sender address and tracking subdomain on a domain you control.

Authentication: Partner or Account token. company_id must be inside your own account tree (a Partner token reaches any account under the partner, an Account token only its own); otherwise 422.

Rate limit: none.