I've written an article / guide on how Fountain publishes podcast payment metadata using nostr - https://primal.net/merryoscar/open-podcast-payments-with-bitcoin-and-nostr
I know not everyone's sold on nostr - but this approach is working today and allows podcast payments to display in other nostr clients (see example in the article) - there's no reason we can't have the same interop between podcast apps.
I know nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqdft4ckvyhfpw3n56zm8j42nzrjeummudr2vmkf304eu5jhnn0ahq7l6746 (nprofile…6746) and nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqyz5hmul3qjuvzgsgh666xenzalxnn9ed55pcduspjfznzqvhwraq4jpvn3 (nprofile…pvn3) are experimenting which is great to see.
I'm also working on a JS library with sample code - will share soon.