@Rizful.com should work well with this, by using a read-only NWC code -- docs here: 
Get A Read-Only NWC Code | Megalith Lightning Docs
How to get a read-only Nostr Wallet Connect code from Rizful
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That is what I am using - the funds are arriving but it's failing this lookup that the store is attempting to verify the transaction. Something to do with LNURL-verify?