Hello, the first thing that surprises about payment processing is that it works independently of your e-commerce store. It is essentially a separate thing/system that only activates when your customer is ready to pay. When using a standard eCommerce store, you have your main store platform/system to power your store website - showcase your products, allow customers to browse and place orders. The actual processing of payments then usually takes place out of the office. Your store only connects to the payment
payment gateway for selling products engine and sends all the necessary data to complete it.