Not sure if you saw this community post on BTCPay and Start9, but maybe it helps? https://community.start9.com/t/guide-bolt-cards-lightning-address-and-reverse-proxy-all-the-things/675
Thank you for the love and support! I hope to have an online shop soon. Waiting for nostr:npub126ntw5mnermmj0znhjhgdk8lh2af72sm8qfzq48umdlnhaj9kuns3le9ll to make it more accessible to integrate with nostr:npub155m2k8ml8sqn8w4dhh689vdv0t2twa8dgvkpnzfggxf4wfughjsq2cdcvg
Discussion
Will check it out! nostr:npub1q8gth72n0mcl6rwls905rsvfvuu0dgaq7cq028rc9d7c3ygnp4xq84awvk helped me quite a bit in this regard but nostr:npub126ntw5mnermmj0znhjhgdk8lh2af72sm8qfzq48umdlnhaj9kuns3le9ll has some limitations atm