Check that the money order amount is correct. To fill out a money order you need to first fill out the who the payee is, the purchasers information and sign it.You are the purchaser that the money order form is referring to on this line. Don't forget to buy your money order for the correct amount (see: passport fees). Does the post office do money orders for passports? You can cash money orders at the Post Office. USPS replaces lost, stolen, and damaged money orders. How to fill out your check or money order. 1. You must present a photo ID, such as your passport, when purchasing a money order. Filling Out a Money Order to Pay the Form I-765 Filing Fee.