This extension displays additional custom fields in order invoice on OpenCart in the admin Orders section. The module adds custom client fields and custom address fields to invoice.
To display custom fields in the invoice form, simply install this plugin and update the modification cache. Custom fields in the invoice will be displayed in the block with customer's address.
With this extension, you can add to invoice own custom fields, such as: VAT ID, TAX ID, DPH, house number, apartment, office, etc.
Module installation instructions:
Upload the module in the admin panel in the "Extensions" : "Install".
Go to the "Modifications" section and update the cache.
Go to the "Dashboard" section and update the template cache.
Bingo!
Changelog of Custom fields in order invoice
v1.0.1 (25 May 2023) - The problem with adding custom fields to the Delivery address has been fixed
OpenCart 3.0.5.1 and 4.1.0.4 shipped on August 11, 2026 with full PHP 8.5 support and a batch of fixes. Release details, OpenCartBot commits and OpenCart 5 plans.
A developer cheat sheet on using ternary operators in Twig. It will be useful for new developers of OpenCart and other CMSs that use this templating engine.
The OpenCart team has officially presented release 3.0.5.0, which contains a significant package of fixes, code cleanup, and compatibility improvements with modern PHP versions.