Hello everyone, tell me what is a payment gateway and what are its functions?

Hello, one of the main issues when choosing a payment system is security. In order to ensure reliability, payment systems use various methods of client authentication. When connecting a payment gateway, you will need to confirm the legality of the business by providing documents and concluding an agreement with the payment system provider. On the side of the payment system, identification takes place, after which you are given the opportunity to conduct transactions in this payment system. Also, international payments are an integral part of every online store, so the payment system must support this function.