How to get signature when login with web3auth?

Hi,

When I authen with web3auth via Google, I saw site call api to parser server:
https://[parse-server.com]/server/users with params:

I want to know how to site have signature ?
I guess can get it from Web3Auth because we have not private key for sign message from my site ?
I tried authen with Web3auth via Google from my app Unity is OK but web3auth not give me signature in results, i don’t know why.

Why my site have it but my app Unity is not.

My results I got from Web3auth.
“email”: “[email protected]”,
“name”: “Nguyen Kelvil”,
“profileImage”: “https://lh3.googleusercontent.com/a/AEdFTp6vFe2PVavVsFzS-h5tRyp_aut9XXGDpD3eGlP5=s96-ds3242c”,
“aggregateVerifier”: “tkey-google”,
“verifier”: “torus”,
“verifierId”: “[email protected]”,
“typeOfLogin”: “google”,
“dappShare”: “”,
“idToken”: “eyJhbGciOiJFUzI1NiIsInR5cCI6IkpXVCIsImtpZCI6IlRZT2dnXy01RU9FYmxhWS1WVlJZcVZhREFncHRuZktWNDUzNU1aUEMwdzAifQ.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.5TahcbHkclNAtwr6koXKPoo23gq0Q0Fl7oHAHqx8P6sRcNlGfqUEiotAUdEib6TWRZ-riLTYn8xgLk3Ay1gORA”,
“oAuthIdToken”: “”,
“oAuthAccessToken”: “”
}

somehow you should be able to sign a message with web3auth and the result of signing that message is the signature that you are looking for