Islam is holding back the
economies of multiple countries through promotion of poor economic practices, high fertility rates, and beliefs that lead to violence and instability.
If a ship is not flying the flag of any country (or flying the
flags of multiple countries), which included if it's stateless but flying a flag without any right to do so, then every country is permitted to board the ship and enforce their own laws.
You will be dealing with information security regarding servers and hosting that is FDIC and FFIEC compliant, software security and insurance for the transaction application itself and how it interacts with your chosen banks; you also need to comply with US federal and state banking laws regarding secure information storage and all laws regarding international financial transactions with
all of the multiple countries you will accept payments from.