What a gambling transaction looks like to everybody who can see it

Deposits and withdrawals appear on bank and card statements with a merchant descriptor that usually identifies the operator, and card networks carry a merchant category code that marks the transaction as gambling regardless of the descriptor. Both are visible to the bank, and the second is machine-readable.

The category code exists so that card issuers can apply rules — some block gambling transactions outright, some treat them as cash advances with a fee and immediate interest. It is set by the network rather than by the merchant, which is why choosing an operator with a discreet trading name changes the descriptor and not the code.

It does not mean a bank is judging the transaction. It means the transaction is categorised, and categorisation feeds automated decisions — lending assessments among them — without anybody reading anything.

Which is where it goes wrong. People use a credit card expecting the same terms as any purchase. Cash-advance treatment is common for this category, and the fee plus immediate interest can exceed the margin on every bet the deposit funds.

What to do with it. Fund a betting account from a debit card or a bank transfer rather than a credit card, and check your issuer's stated treatment of gambling transactions before assuming it is an ordinary purchase.