Which of the following is an acceptable payment method for passport fees at USPS?

The most suitable payment method for passport fees at USPS is a money order. This form of payment is widely accepted for governmental transactions, including passport applications, as it provides a secure and traceable way to transfer funds. Money orders can be purchased at various locations, including post offices, eliminating the need for a personal bank account or credit rating, which makes it accessible for many applicants.

Credit cards may sometimes be accepted in specific locations, but due to varying policies at different postal facilities, they are not universally reliable for all passport transactions. Personal checks made out to an individual are typically not accepted because passport fees must be made out to the "U.S. Department of State." Gift cards are generally not considered an appropriate form of payment for government services, including passport fees, as they do not ensure the funds are available directly as required by the government agency. Thus, the use of a money order ensures compliance with accepted payment methods for passport fees.