OpenCart Support UK

OpenCart versions and the PHP problem

OpenCart is a lightweight, free shopping cart that many small UK retailers chose years ago. Plenty of shops still run OpenCart 2.x or early 3.x on old PHP versions. As hosts withdraw PHP 7, those shops start throwing deprecation notices or fatal errors.

The project now maintains two branches: OpenCart 3.0.5.1 and OpenCart 4.1.0.4, both released in 2026 with PHP 8.5 compatibility. OpenCart 4 changed the extension structure substantially, so extensions written for 3.x will not run on 4.x without a new version from the developer.

OpenCart faults we fix

• Modification problems: OCMOD (and vQmod on older stores) patch core files at runtime. When two extensions modify the same line, one silently fails. We read the modification log, refresh the cache in Extensions > Modifications and resolve the conflict.
• API permission warning on orders: the API user's IP is missing from System > Users > API, often after a hosting move. We add the server IP.
• PHP 8 errors: old extensions using removed functions or old syntax. We patch the code or replace the extension.
• Checkout stuck: JavaScript errors from theme or extension conflicts, or a payment extension that does not support your OpenCart version.
• Admin session problems: session path, cookie or HTTPS setting mismatches in config.php and admin/config.php.
• Storage and error logs: huge error logs filling disk space, or the storage folder sitting inside the public web root.

Upgrading OpenCart

Upgrading from 2.x or 3.x to OpenCart 4 is less of an in-place update and more of a careful move. Our approach:

1. Back up and copy the shop to staging.
2. List every extension, theme and modification, and check whether a 4.x version exists.
3. Upgrade the core and database on staging using OpenCart's upgrade script.
4. Install the 4.x versions of extensions, or replace them; rebuild theme customisations.
5. Test products, options, customer accounts, checkout, payments and order emails before going live.

Sometimes staying on the 3.x branch with PHP 8 fixes is the more practical option for a small shop. We give you both costs. Upgrades are quoted; see PHP version upgrade.

Keeping an OpenCart shop secure

We rename the admin folder if it is still /admin, move the storage directory outside the web root as OpenCart recommends, remove unused extensions, update the core and extensions, check user groups and permissions, and force HTTPS. If your shop is showing spam or redirects, or customers report card fraud, see malware removal.

Everyday OpenCart jobs

Beyond fixes, a lot of OpenCart support is routine shop work that owners do not have time for:

• Adding or bulk-importing products, options and categories.
• Setting up geo zones, tax classes and shipping methods so UK and international delivery rates are right.
• Configuring payment extensions for PayPal, Stripe or other gateways and testing them end to end.
• Creating coupons, vouchers and customer groups for trade pricing.
• Tidying SEO URLs, page titles and meta descriptions, which OpenCart sets per product and category.
• Clearing out old carts, sessions and logs that slow the admin.

On the Business and Complete plans, these tasks come out of your included monthly hours. Without a plan, they are billed at £45 an hour + VAT in 15-minute blocks after the first 30 minutes, so a quick product change does not cost a full hour. See content updates.

OpenCart support prices

One-off OpenCart fixes are £45 an hour + VAT, with a 30-minute minimum then 15-minute blocks. Plans: Essential £25 a month + VAT (updates applied and checked, daily backups, uptime and security monitoring), Business £50 a month + VAT (plus an hour of fixes and priority support), Complete £99 a month + VAT (three hours a month plus IT and Microsoft 365 helpdesk).

Major upgrades and migrations are quoted. See our ecommerce support page or get in touch.

What it costs

Support plans from £25 a month + VAT, or £45 an hour + VAT for one-off fixes. Pick a plan if you want it looked after every month, or pay by the hour for a one-off job.

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