Claim gives you all collected eCash proofs.

It depends on what you want to do with the eCash. You can claim it inside your own eCash wallet or use it to pay a Lightning invoice. On https://app.cashu-address.com I built flows for both cases 

 Ok thanks, need to learn more about eCash now. 

 No problem. Happy to answer questions at any time. I can also recommend joining the Cashu dev channels (either telegram or discord)