Implementing Oauth2 login, Fatal error: Class 'Google_Service' not found

Question

I am updating my website\'s login system from LightOpenID to Google\'s Oauth 2.0.

When I require the Client.php and the Service/Oauth2.php I get an error

Answer 1

While working with Google API integration

Fatal error: Class 'abc' not found

error comes when there is definitely something different between the library you have in composer.json above, and the library that is actually being auto-loaded.

had same problem just changed in my composer.json

{"require": {"google/apiclient": "1.0.*@beta"}}

to

{"require": {"google/apiclient": "2.0.*"}}

and then execute php composer.phar update (make sure you give right path for .phar file)