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.
Mr.Rajiv Khanna and his team are handling my GC process. I interacted with Rita Dhakal for entire GC process; My Labor and I140 are approved without a issue. I also applied EAD cards renewal (Mr. Khanna Office reminded me) for my wife and me. They were submitted for approval. By looking at the entire process and Mr. Khanna team, I always feel I am getting the best service. Rita is very cooperative, faster response and great knowledge.
I always recommend my friends to Mr. Khanna team.