Cards remain the method most players reach for first, and the method most likely to fail them. Gambling transactions are declined at rates that would be treated as an incident in retail, and every decline is a deposit you paid acquisition cost to generate and did not receive.
That reframes what matters when choosing an acquirer. A provider two basis points cheaper that declines four percent more of your traffic is more expensive, and no amount of negotiating on the headline rate will close the gap. Ask for authorisation rates by market and by card type, never as a global average — averages hide the corridor where a provider is failing badly, and that is frequently the market you are expanding into.
The harder constraint is appetite. The strongest card processors are the most selective about gambling, and several will not onboard the category in markets where they otherwise operate happily. Coverage and availability are different things, and discovering the difference after a technical evaluation wastes the evaluation.
Behind most processors sits a sponsor bank whose risk appetite governs what the processor can actually do. Providers holding their own acquiring licences remove a link from that chain — worth asking about directly, because it predicts stability better than any SLA.
