Plain-English definition
payment gateway
What it means
A payment gateway is the service that securely handles card payments inside your app: it takes the customer's card details, checks with the bank, and confirms whether the payment went through. It means you never have to store sensitive card numbers yourself.
In plain terms
Like the card reader at a shop counter that takes your tap, quietly checks with the bank, and beeps to approve the sale before anything leaves the store.
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