Integrate custom payment gateway

We live in a country that the supported payment processors in Open edX aren’t available so we need to integrate a custom payment processor.
I have tutor 14.0.4 installed. In the README of e-commerce plugin for Tutor it’s mentioned that as of Lilac (Tutor v12), Open edX no longer supports custom payment processors with e-commerce. However, in this issue there is a discussion about adding support back in for custom payment processors and the non-MFE payment flow that was deprecated. The discussion is closed as completed for the Nutmeg release. I’d appreciate if someone could explain whether it is possible to add custom payment processors in the latest release.