We integrate the gateway or API your store actually needs, including custom modules when no extension exists, across OpenCart 3.x and 4.x, and test the checkout before it goes live. From $290.
Search “OpenCart payment gateway integration” and every result tells you to install an extension. That is fine until the gateway you need has no OpenCart 4 module, the 3.x one collides with your other OCMOD changes, or the marketplace version is abandoned and breaks on update. Then you are stuck, and the checkout is the one page that cannot be flaky.
We integrate gateways and APIs into OpenCart the way your store needs them. If a solid extension exists, we install and configure it properly. If it does not, we build a custom payment module against the gateway’s API. Either way we work across OpenCart 3.x and 4.x, untangle the OCMOD and vQmod conflicts that break checkouts, and test a real transaction before you trust it with customers.
OpenCart 3.x and 4.x have different extension systems, so a module written for one often will not run on the other. We check your version first and build for it.
OCMOD and vQmod patch core files, and two extensions editing the same file fight. We trace the conflict instead of disabling things until checkout loads.
Plenty of regional gateways and internal APIs have no OpenCart module. We write one against their API rather than telling you to switch providers.
The marketplace answer assumes a maintained extension exists for exactly your gateway and version. Often it does not. The work is making the integration fit your store, not bending your store to fit a plugin.
We scope the gateway or API with you, confirm your OpenCart version, then quote a fixed price. A build includes the items below.
A working checkout and the notes to run it.
The payment method live in your store, tested with a real transaction end to end.
OCMOD and vQmod checked so the new module does not break an existing one.
What is connected, how refunds and webhooks behave, and how to run a test order.
If the integration breaks because of our code in the first 30 days, we fix it free.
Most single-gateway integrations run a few days to a week.
We confirm the gateway, your OpenCart version, and whether an extension exists or we build custom. You get a fixed quote first.
Day 1We integrate and test against the gateway sandbox, including refunds and the conflict check.
Days 2-5We run a live test order with you, confirm the order-status flow, and hand over the doc.
Days 5-7Quoted per gateway after the scope call. Custom modules cost more than installing an existing extension, and we tell you which one yours is up front.
Send us the gateway’s API docs and your OpenCart version. We will tell you within a day whether there is a usable extension or it needs a custom module, and what each costs.
A payment integration touches the most sensitive part of your store, so it pairs naturally with OpenCart security and hardening to keep card data and the admin locked down. If a bad update or conflict has already broken your checkout, OpenCart restoration gets it back first. This is part of our wider website integration work, set up for the way OpenCart handles extensions. Running Drupal as well? See our Drupal integrations work. At the server level, we do the same wiring and automation beneath the application.
When the job is more about AI than plumbing, see our AI integration for OpenCart.
Wiring up checkout specifically? Start with our comparison of OpenCart payment gateways.
We'll triage the same day. Send context, screenshots, error messages — whatever you have. No sales calls, no chatbots.
