I-20 is the ID card issued by the school to foreign students

I-901 is an identity registration required for anti-terrorism. Just think of I-901 as a receipt. .

Log in to the SERVICE system online, fill out I-901 online, and pay a fee of US$100. No documents are required. Just be prepared to return your passport, credit card and other information

Fill it out and send it to the toll office along with your check or money order.

If you pay online, there is no need to advance 3 days in advance. When I applied for a visa in Beijing, I forgot to pay the Sevis fee in advance. I paid it on the day I applied for the visa. I asked the visa office and they said that as long as I have a printed receipt, it doesn't matter the time of payment.

In the end, the visa was successfully passed, so be sure to print the receipt when submitting it online! ! ! ! !