nostr:npub1sg6plzptd64u62a878hep2kev88swjh3tw00gjsfl8f237lmu63q0uf63m nostr:npub1ds3hmzemzgp9rsuvyvxqdk0y3uxnq9m903dktjxrvyfwk9w99t4sc2hzcn could you just make the cash app QR code a lightning invoice? If the user scans the invoice with Cash App, you could detect if the invoice was generated by you and then prompt the user in the app if they want to pay with bitcoin or fiat.
