title: Google OAuth 2.0 for WinForms C#
body: <p>How would one send an email from google to other users when they register.</p>
  
  <p>Website to get all this info: <a href="https://console.cloud.google.com/apis/" rel="nofollow noreferrer">https://console.cloud.google.com/apis/</a></p>
  
  <p>What I currently have:</p>
  
  <ol>
  <li>Client ID</li>
  <li>Client Secret + json file</li>
  <li>API Key</li>
  <li><code>using Google.Apis.Auth.OAuth2;</code></li>
  </ol>
  
  <p>Is this all I need to create the OAuth 2.0? And how would I?
  Every tutorial states some use for p12 key which I do not have nor can find.     </p>