I use RTL (https://www.ridethelightning.info) but I access it inside my instance of BTC pay server. For that I just follow the directions in this video (https://youtu.be/-GJr4XjRCPo?si=qIKaaScUwfVV_Scj&t=3072) additionally LNBIG is involved. I think I open the channel on LNBIG by making a payment to them at (https://lnbig.com/#/) nostr:npub1vwymuey3u7mf860ndrkw3r7dz30s0srg6tqmhtjzg7umtm6rn5eq2qzugd