You have to send documents that can prove your identity such as an ID, Passport, or Driving License. The copy that you send to the casino needs to be clear and your image should be visible. You also need to send proof of your identity, and you can do that by sending a copy of a recent utility bill or a bank statement. In some cases, you will have to provide proof of the payment method that you use, and depending on what you use you may be required to send a screenshot or a copy of your credit or debit card.