How can I integrate my erpnext with N-Genius Payment Gateway?

I installed Webshop and I published items, but I need to enable payment with N-Genius.

What should I do ??

They have a developer documentation where the use of the their API is explained:

You need to match these requirements of the API and the legal requirements at the place you do business with the places of the code of ERPNext where you can hook the API into, and then test and debug this integration until everything works as required and expected, and then share everything with your documentation on github or gitlab, and Frappe Marketplace. At least that’s how everybody supposes it to work.

image

Should I create doctype for “N-Genius Settings” like settings in images ??