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Summary
I have migrated to the GIS but unable to understand how to get the User Profile Info without using the Auth Code. So I use the Authorization Code Flow which returns the Auth Code, which I send back to the backend. But I also require the user email id to map the same. But I am unable to find any documentation which solves this problem.

To get user profile information one needs to use the Auth Code and generate the access_token and refresh_token and use the same to call People's API. But then the Auth Code cannot be used by the backend.

Currently I am using an input field to get the user email id but it's causes issues due to typos.

function initClient() {
client = google.accounts.oauth2.initCodeClient({
client_id: CLIENT_ID,
scope: SCOPES,
ux_mode: 'popup',
callback: async (response) => {
auth_code = response.code;
// Logic to send the Auth Code to the backend with user email ID
}
});
}