Why licensing comes before the gateway
Card schemes classify gambling under MCC 7995 and require acquirers to confirm the merchant is licensed for each market it accepts players from. A Curacao, Anjouan, Malta or Isle of Man licence opens different doors, and some regulated markets such as the UK require a local licence from their own regulator. An acquirer will not support player traffic from a country your licence does not cover, so the market list you submit has to match the licence exactly.