Cash-like treatment and what it costs
A big reason issuers refuse gambling deposits is they may treat that transaction as a cash advance or quasi-cash transaction. That changes the rules for interest. The interest starts on the day the trading posts, not on the day of the statement. It also probably carries a separate fee of several dollars that arrives with the transaction. All of this is written down in the cardholder agreement. Feeling confused that the casino is showing two fees on your mobile phone, one for the payment and one for the interest? That may be because the card issuer has classified your deposit as quasi-cash. It carries both fees. The two may be different amounts, one mostly from the casino and one mostly from the card issuer, so even when they are added together it still looks odd on the phone screen.
Four things on your own side
If your deposit is going in from an address that has nothing to do with your name, or your card is in somebody else's name, or the operator does not allow credit cards at all, there are some other things look for on your side of the payment. And the whole thing starts with the state rules. First, the credit card on the device in your hand is only saying the state rules allow credit cards. It is still up to the licensed casino to allow credit cards and state by state, they do not all. So a $50 fee from an operator that does not let credit cards could be more than the cost of cash in ATM fees. Second, a named bank card that matches the casino account is important. The transaction must be in the name on the gambling account, and if the phone's wallet is on a company card, with the company name, the deposit is refused because the holder looks wrong to the card issuer. The failed attempt simply costs more fees in a cycle. So having the credit card in your own name on the phone, in the name of the gambling account, starts with the deposit screen on the cashier: > [ ] Use a card in the account holder's own name if that refusal is still implacable, the player flag carries another route: in some states, some card issuers let the player tick a box to let some of those transactions through. On the card issuer side, the cardholder agreement holds the fact of quasi-cash treatment and how the interest starts. On the player side, the matching name and billing address come first.
What a successful deposit does not promise
Having got a successful deposit through the cashier on a card that matches the phone wallet in all other ways does not promise that how the money returned will be the same. It is a separate thing. The payout route and the payout speed may be in the gambling terms but it may not be as fast or as direct as a card. And the crucial point to repeat here is that the refusal message carries no reason for the failure. Lists of decline codes are not useful because a term like that does not trigger them. Checking the fees is not useful because the amounts are not the fees. The player cannot repeat the attempt with a minor change, like bumping the amount down. The only way the card payment can succeed is if the card issuer has marked the phone's pocket booking as the address for that cardholder, and it has answered 'yes' to the choice of whether to let those transactions through. And checking all of that on the past successful deposit counts: the fact of a successful deposit is not a route-map to another successful trip through because the card issuer's refusal came from another rule.