Is there a public repo?
GM nostr:nprofile1qyt8wumn8ghj7etyv4hzumn0wd68ytnvv9hxgtcpzemhxue69uhks6tnwshxummnw3ezumrpdejz7qpq2rv5lskctqxxs2c8rf2zlzc7xx3qpvzs3w4etgemauy9thegr43sugh36r (or GN here in the UK)
Thought you might like to see what I've been working on. It's an updated version of Cashu Redeem that uses latest cashu-ts, reads v4 tokens, and gives 'change'.
Discussion
Not yet... it's bundled into a WordPress plugin that runs the whole site.
There is fairly transparent console logging, and it's all front end JS, so should give a fairly clear idea of what is going on meantime.
It's based on the existing Cashu Redeem repo, but updated to use latest cashu-ts library and with some tweaks to support return of change.