A payment gateway integration is a program that you can integrate into your transaction and sale system in your store.
Usually, there are payment gateway providers for storefronts as well, and they are certainly used for online stores as well.
When you check out on a website for online shopping, you are always able to select a payment method, and then you can pay accordingly.
When you are paying online for items to be delivered, you are using a payment gateway system, and it is important for the company that uses the payment gateway to choose the appropriate payment gateway provider for their company.
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