OpenCart Community

Hello,

I need to add to my shop as payment method a online payment service provider. They do not have own extension. Are there any modul that i can add security keys, give a link and rest paramets and it will work for me? Or maybe there are simple module, that i can change code to my own?

Thank you for attention,
Best Regards.

To answer to your question... First, you need provide tech documentation for this API.

Nearly for all PSP are extensions existing (not all are listed on the OpenCart Marketplace).
You should state which 'online payment service provider' you mean, post a link or name.
And also PayPal, Stripe, etc. are PSP ..