Abre el siguiente enlace en tu navegador e introduce el código:
https://accounts.google.com/o/oauth2/auth?response_type=code&access_type=offline&client_id=627988859123-6n6u5lkn1fbm30it7ps2gng78cg7t07p.apps.googleusercontent.com&redirect_uri=https%3A%2F%2Fmailchimp.venturapp.com&state&scope=https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fgmail.send&prompt=select_account%20consent
Introduce el código de autenticación: <br />
<b>Fatal error</b>:  Uncaught Error: Undefined constant &quot;STDIN&quot; in /home/venturap/mailchimp.venturapp.com/index.php:35
Stack trace:
#0 /home/venturap/mailchimp.venturapp.com/index.php(79): getClient()
#1 {main}
  thrown in <b>/home/venturap/mailchimp.venturapp.com/index.php</b> on line <b>35</b><br />