Hello, no matter which option you choose, you need to analyze the shortlist of payment companies in terms of the cost of cooperation with them: what you need to pay for - and what not, how the tariff changes and what affects it, what is included in the paid service, what regulations and payment options. After one or two payment providers remain in the list, which are the most suitable for you from the financial side of cooperation, you can move on to onboarding and the technical part. I can suggest you visit
https://payadmit.com/, where you can read information about one of the most popular and reliable payment systems.