process.env.KEY and process.env.PROOF? I can’t find them

[NingXinHui]

const principal = Signer.parse(process.env.KEY) const proof = await Proof.parse(process.env.PROOF)

What are process.env.KEY and process.env.PROOF? I can’t find them

The documentation of @web3-storage/w3up-client is frustrating! ! ! !