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I don't think you'll be working with the processing directly-- very much voloquia/responsibility, a lot of trenches are required.You'll probably be working with an intermediary office, many of them. Each office invents its "most correct" protocol, but all of them are very similar and simple to use."whatever was asked for a payment permit every time." Token pay.Example in some of these offices: https://wiki.wayforpay.com/pages/viewpage.action?pageId=852175 www.liqpay.com/ru/doc/paytokenpayu-api.ru/pages/viewpage.action?pageId=1376262UPD fondy.eu found another one. Works in different countries, supports kiwis, etc., but does not write clearly to the commissions.Legally, either a public offer for a physical, or a contract is made to accept payments from the public.It's gonna cost you, usually 2.5% of the payment.