When I need to fill up and submit letter of authorization? Lili Follow The format of authorization letter should include the date, name of the person to whom it is written, detail of the person who has been authorized (like name and identity proof), the reason for merchant owner unavailability, duration of the authorized letter and action to be done by another person during merchant registration. And you can download the letter of authorization here https://drive.google.com/uc?export=download&id=1Q1QO5qr_CbyEDFAMnBe7ommRtbnHyR3U