Thanks for the answer. I looked at this documentation a while ago, and looked again. I did not find what I needed.
I was wondering if you have how to create a coupon to consume hikapoints, or something like that. On the payment page, the hikapoints plugin updates the purchase and the user must again select the payment (not interactive): the user would ideally click a button or select a box.
You could tell me what the "virtual coupon" option offers, I am lay and I did not understand the documentation.