The URL
https://sheets.googleapis.com/v4/spreadsheets/[ID_OF_SPREADSHEET]?key=[MY_API_KEY]
What I get
   {
      "error": {
        "code": 403,
        "message": "The caller does not have permission",
        "status": "PERMISSION_DENIED"
      }
    }
At the moment, I have no Key Restriction on my API Key for the sake of testing.
I've had a look at a past question that's been popular but no luck.
 
     
     
     
     
     
    