I understand, but curious as to why it couldn’t say:
“Could not pay the invoice. There is no route, or it may have been paid.”
That way you’re not giving an absolute. Just thinking of user experience.
I’m just trying to solve this UX problem:
nostr:note10lvqwsw8wkf5ev8s6hzj53esyg8ewyuw3e3jpl2aqt9dvxyurluqjlml5p
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I think you're just hung up on this issue of someone else paying the invoice which shouldn't happen.
What’s the solution, then? Paid invoices in notes still appear payable, and when the second person tries to pay it, they often get confused and gripe about it.