All I\'m trying to do is read a Google Spreadsheet from a web site. I\'ve read and re-read the Google Drive API docs and everything Google Drive PHP on Stack Overflow and I
If you want you own file to be read you need a service account instead of a "Client ID for web applications". I've been battling this problem myself for way to long and this brought me the sollution:
https://developers.google.com/drive/web/service-accounts