Payment Gateway
The technology that securely transmits card data from checkout to the processor. It is not the same as a merchant account.
A payment gateway is the software layer that carries card details from your checkout to the processor and returns an approval or decline. It handles the technical transaction; it does not hold your money or decide whether you are approved as a merchant.
Keeping gateway and merchant account distinct matters because they fail independently. Your merchant account can be closed by the sponsor bank while the gateway keeps working, and a gateway outage stops sales while your account stays perfectly healthy. Knowing which layer has broken is the first step in fixing an incident.
The gateway also determines your PCI scope. A hosted field or redirect means card data never touches your servers and your compliance burden shrinks dramatically. A gateway that posts raw card data through your own backend pulls your entire infrastructure into scope, which is a far heavier and more expensive obligation.
For high-risk merchants the decisive feature is whether the gateway supports more than one acquirer. A gateway tied to a single processor becomes a single point of failure the day that processor changes its risk appetite.