If you have submitted all the information, including proof of financial resources, there should be no big problem. You may need to check your information and address.
A credit card is required. In addition to financial resources to prove your repayment ability, the information also includes your housing, tax filing records for the past three months... there are a lot of them. You can just go to our bank, or your card issuer! In addition, your bank has cash. If you use 50W, you can save a lot of links -