The Cashu string is the invoice for eCash
Discussion
So I can set up a wallet and paste that in to receive eCash?
Yes indeed. Any cashu wallet. I have been using nostr:nprofile1qqs9ajjs5p904ml92evlkayppdpx2n3zdrq6ejnw2wqphxrzmd62swspzemhxue69uhhyetvv9ujuvrcvd5xzapwvdhk6qgdwaehxw309aukzcn49ekk2qghwaehxw309aex2mrp0yh8x6tpd4ehgu3wvdhk6ynf30t the most as of late. There are a host of others.