Hello!!!

You just need to provide the proof of your transaction. The proof can be any screenshot of payment or the transaction history of your bank account where the payment details are mentioned. You can check your transaction history by opening your bank's online website and logging in through your NetBanking id and password and there you will be able to see your all the  transaction. You can otherwise go to the bank and get the passbook and get the transaction history printed on your passbook through the machine and can give it's photocopy in the document verification.