Chapter 03 / Integrate
Last updated: November 2026 | Published by Avendo
To integrate a payment gateway in your website, you open a merchant account, connect a gateway to your checkout with a plugin or API, test it and go live over HTTPS; Avendo extends that setup by connecting one checkout to multiple processors.
Most integration guides stop at one gateway. Avendo starts from the checkout you already have, connects it to several PCI DSS-compliant processors and gateways, and routes each transaction to the processor offering the best available rate in real time. You keep one checkout, gain several routes and get clearer processing reports.
You integrate a payment gateway with your website in five moves: get approved for a merchant account, choose how the gateway connects (a plugin for your e-commerce platform or a direct API), add it to your checkout, run test transactions and switch to live mode. People search this as "how to integrate website with payment gateway" or "how can I integrate payment gateway", and the answer is the same either way.
The decision most guides skip is how many processors sit behind that checkout. With one gateway, every sale is priced by one contract. With Avendo, your existing checkout connects to multiple processors and each sale is routed to the best available rate.
Evidence cards
These are general industry requirements. Your processor confirms the exact list.
A payment gateway securely carries card details from your checkout to the processor. A payment processor moves the transaction through the card networks and banks. A merchant account is where approved funds land before they settle into your business bank account. Many providers bundle all three, which is why people often use the words interchangeably.
Avendo sits one level above this bundle. Rather than being one more gateway, Avendo connects a checkout to multiple payment processors and decides, in real time, which one handles each transaction based on the best available rate. Every processor and gateway Avendo works with is PCI DSS compliant, the standard maintained by the PCI Security Standards Council.
| Criterion | Avendo multi-processor connection | Platform plugin, one gateway | Direct API, one gateway |
|---|---|---|---|
| Starting point | Your existing checkout pages | Your e-commerce platform's plugin library | Custom checkout code |
| Processors reachable | Multiple | One | One |
| How each sale's rate is set | Best available rate, chosen in real time per transaction | Fixed by that gateway's pricing | Fixed by that gateway's pricing |
| Technical effort | Depends on your checkout; Avendo confirms the steps | Usually the lowest for supported platforms | Highest, requires developer time |
| Compliance | Only PCI DSS-compliant processors and gateways | Depends on the gateway | Depends on the gateway and your code |
Integration guides treat go-live as the finish line. In practice, go-live is when your pricing freezes: the gateway you integrate decides the rate on every future sale until you do the work of switching. That is why businesses that searched "integrate Stripe payment gateway" or any single provider often revisit the decision later.
Avendo is built around that gap. It connects one checkout to several processors, so the rate decision is made again on every transaction, and its reports show what each sale cost. To see how this plays out for costs, read credit card processing cost. Platform teams should also read payment processor for platforms.
Tell Avendo how your checkout is built. It works with existing checkout pages and connects them to multiple PCI DSS-compliant processors.
