nostr:npub155m2k8ml8sqn8w4dhh689vdv0t2twa8dgvkpnzfggxf4wfughjsq2cdcvg is the way IMO. Self-custody & self-sovereign.

I know you’re already familiar with nostr:npub1sweetl0gskmka0n5qevt7v2wj9q56ntwkmaeywffw4ftaucmcakquhns6h (https://sweetsats.io/). It’s set up using woocommerce with BTCpay as the sole payment gateway.

I’m happy to help or offer advice on setup if you decide to go that direction!