Hello, currently there is a large selection of ready-made payment systems. While the overall feature set is similar, there is still no single, universal payment standard on the internet. Differences exist both internationally and within individual countries. Sending and receiving electronic payments is carried out in different ways. I would recommend you a payment system at https://payadmit.com/features/sell-digital-products/, with which you can accept online payments from different countries and in any currency.