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.
Hi i am from Greece i had a telephone conversation with Mr Khanna about EB1 and EB2 and NIW he was very helpful explaining to me that applications for the above are quite difficult for sb that has only a masters degree hence under his guidance i decided to do an MBA and later with his help to get H1B and apply for the green card. thanks , sotiris