Being a PSP for High Risk merchants, we have had to install the checkout through other partners, which is not really the desired flow, since it adds unnecessary cost to the whole process. Anyone who know how to get an invite for us to become a Payments Partner? We are already a partner with one public app so far. But the big dream here is to build 3rd party payment apps for high risk merchants whom Shopify Payments do not cover anyway!
Please push us in the right direction or get us that invite only. Or let us know some more info.
We have the exact same question. We are building Treat, a payment method to use HSA/FSA funds at checkout. Our website is savewithtreat.com. We are building our whole business around becoming a payment partner, so becoming a payment partner is really important for us.