Yeah or send to a Nostr npub via DM (not NIP-04), email or PDF receipt to save (or similar).

Something that I've noticed some folks ( e.g. nostr:nprofile1qqsgfayysx8nscjz5keaw66x0nsfuu8kuxsls34x5ky9rrg5d2w5r5cpzdmhxue69uhhqatjwpkx2urpvuhx2ue04tyfa4 ) will do for films purchased with sats, is to use a URL (Vimeo) and a password. So perhaps the encrypted URL can also include some additional meta data? And perhaps a clickable link and/or redirect!?

More integration with Nostr could also be interesting, a sort of receipts or paid stuff catalog kind. Could eventually integrate with Kodi, NewPipe, nostr:nprofile1qqswhhhf99z77pfg80s2c00z27rusxn2tzss7450n34krkwa2yadhtgpp4mhxue69uhkummn9ekx7mqpz3mhxue69uhkummnw3ezuerkv36zuer9wcq3vamnwvaz7tmpw5h8yetvv9ukzcnvv5hx7un8lpntld devices for books and etc. And could also work with subscription services for relays, vpns and such.