As a convinience, send google the 'hd' parameter representing which domain to restrict sign-in to.
As a convinience, send google the 'hd' parameter representing which domain to restrict sign-in to.

Only set when `requiredDomain` is configured.

NB: As per official documentation from Google, you still need to check that the returned user
is indeed belonging to the `requiredDomain` which is code already present.

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