USCIS Guidance on Payment of N-400 Application Fee with a Credit Card
You may pay for your N-400, Application for Naturalization, using a credit card. There is no additional fee to pay with your credit card. The N-400 is the only form that can be paid for by credit card using the G-1450, Authorization for Credit Card Transaction.
Acceptable Credit Cards
You may use Visa, MasterCard, American Express and Discover. You may also use gift cards with Visa, MasterCard, American Express and Discover logos.
Thank you Mr.Khanna and Team for helping me out with my questions on my status after getting laid off from the company when my GC was pending. He was very patient and answered all my questions. He also advised me on what not to do and what can I do in my situation. This was a big stress relief.