Token, you can validate it by yourself. https://developers.line.biz/en/docs/line-login/integrate-line-login/#write-original-code LINE Login provides a utility API and you can use it to verify ID Token. https://developers.line.biz/en/reference/social-api/#verify-id-token curl -v -X POST 'https://api.line.me/oauth2/v2.1/verify' \ -d 'id_token=eyJraWQiOiIxNmUwNGQ0ZTU2NzgzYTc5MmRjYjQ2ODRkOD...&client_id=1440057261' { "iss": "https://access.line.me", "sub": "U1234567890abcdef1234567890abcdef", "aud": "1234567890", "exp": 1504169092, "iat": 1504263657, "nonce": "0987654asdf", "amr": [ "pwd", "linesso", "lineqr" ], "name": "Taro Line", "picture": "https://sample_line.me/aBcdefg123456", "email": "
[email protected]" }