Redeeming Cashu tokens onto Lightning like a pro:
1) Base64-urlsafe decode the part after cashuA...
2) You will get a JSON, let's call it cashu.
3) Notice the proofs in cashu.token[0].proofs
4) Get the Mint URL in cashu.token[0].mint
5) Get the value of the token:
```
let totalAmount = 0;
cashu.token[0].proofs.forEach((proof) => {
totalAmount += proof.amount;
});
```
(or use .reduce)
6) Create a Lightning invoice for the receiver (using LNURL?) worth totalAmount*0.98 but at least 2 sats less.
Make a POST request to the mint URL:
```
curl -X POST https://mint.host:3338/melt -d \
{
"proofs" :
cashu.token[0].proofs,
"pr": "lnbc100n1p3kdrv5sp5lpdxzghe5j67q..."
}
```
