The payment gateway works as follows. The client orders the goods in the online store and goes to the payment page. Then he enters the details of the bank card on the website of the payment system. The gateway transmits the received information to the acquiring bank. Next, the bank sends an authorization request to one of the international systems through which the payment is made (Mastercard, Visa). She confirms the payment by sending an authorization code through the acquiring bank i.e.
cashiering software. At this moment, the user receives an SMS from the bank on whose card the payment is made. He enters the numbers on the site and receives confirmation of the successful operation. The process itself takes a few seconds, but delays are possible. They occur due to the large number of simultaneous requests that come through the payment gateway.