Hello.It seems at the moment there is only API.It seems that there is no way to insert a button for payment using the usual HTML code. If I'm right, then you need to either look for a programmer or wait until this payment method appears in the program.

I sent a notification about your question to the company employees, expect an answer from them here in the comments.

Hello Martin

I can confirm what Aleksej said. At the moment, you need to either look for a programmer or wait until this payment method appears in the program

The Staff is unfortunately unable to provide support for the integration of custom codes or payment methods

Thank you for your understanding

Stefano