Hello,
sadly I'm not able to read what is written in those screenshots, because it's not in English.
I assume though, that the casino wants a mifinity statement showing that you are in charge of the account plus the proof of transaction.
If you are not able to provide a screenshot showing the account holder's full name (your full name) plus email and the transaction history showing the deposit. You should contact the casino to advise you further.
Maybe you can record a video to prove that the account is yours showing the associated card and the credentials somewhere in your account details.
Sadly I find that Mifinity has poor support, and no live chat available so I was only able to find out how to verify the card and bank account.
"What is an account verification document?
A bank verification form is a document used by financial institutions to verify account information. A bank or other financial institutions can use a bank verification form for account transactions. This form can help to confirm the borrower's related information along with the representative's verification."
How do I get an account verification letter?
To obtain a bank confirmation letter from your bank you may request in-person at a bank branch from one of the bankers, by a phone call to the bank, and depending on the financial institution, through their online platform."
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