This free extension can be used with OpenCart version 3 or 4. You can also find this extension on the OpenCart marketplace.
You can find a detailed installation guide on how to setup the extension on our OpenCart documentation.
If you have issues or feature requests feel free to open an issue or join us on our chat or telegram channel.
Please let us always know your OpenCart, BTCPay extension, PHP versions. You can find them on the extension configuration page.
OpenCart 4 development happens on the master branch and OpenCart 3 is maintained on the 3.x branch but is mostly in maintenance mode.