Extending BOLT-4 to allow anonymously returning a token to the sender

[l0k18]

I am working on https://github.com/Indra-Labs/indra and one of the key parts of the protocol is the return of a token to the buyer, who pays anonymously via several proxies, onion routing style.

Adding a simple mechanism to return a token would also enable digital delivery purchases.

Not sure where to start with this?