title: How can I restrict google login to my company's email domain (@company.com) in flutter?
body: <p><strong>Question</strong></p>
  <p>What is the best way to prevent users from using an email address that does not end in @mycompany.com from logging in to our internal app through Google auth?</p>
  <p>I am new in flutter so can someone provide me the references or tutorial on how to implement this?</p>