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.
What an integration covers
We scope the gateway or API with you, confirm your OpenCart version, then quote a fixed price. A build includes the items below.
- Gateway or API integration on OpenCart 3.x or 4.x
- Extension install and configuration, or a custom module if none exists
- OCMOD and vQmod conflict check against your existing extensions
- Checkout flow testing with a live sandbox transaction
- Refund and webhook handling where the gateway supports it
- Order-status mapping so paid orders land in the right state
- PCI scope kept low by using hosted fields or redirect where possible
- A test order on the live gateway before handover
- A short handover doc: what is connected and how to test it
What you get
A working checkout and the notes to run it.
Working gateway
The payment method live in your store, tested with a real transaction end to end.
Conflict-free install
OCMOD and vQmod checked so the new module does not break an existing one.
Handover doc
What is connected, how refunds and webhooks behave, and how to run a test order.
30-day fix window
If the integration breaks because of our code in the first 30 days, we fix it free.
How a build runs
Most single-gateway integrations run a few days to a week.
Scope call
We confirm the gateway, your OpenCart version, and whether an extension exists or we build custom. You get a fixed quote first.
Day 1Build and test
We integrate and test against the gateway sandbox, including refunds and the conflict check.
Days 2-5Go-live
We run a live test order with you, confirm the order-status flow, and hand over the doc.
Days 5-7Fixed price per integration
Quoted 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.
No extension for your gateway?
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.
- One gateway or API integration
- Extension install and config
- OCMOD conflict check
- Live sandbox test
- 30-day fix window
- Custom payment module built against the gateway API
- OpenCart 3.x or 4.x
- Refund and webhook handling
- 30-day fix window
What we work with
How this connects to the rest of the stack
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.
Need integrations for OpenCart sorted?
We'll triage the same day. Send context, screenshots, error messages — whatever you have. No sales calls, no chatbots.