Why is ajax request for Google+ throwing an error?

Question

Google

I'm trying to get the number of shares through ajax, but it gives me an error. I substituted the key for the second word key
Error 403 (Access Not Configured. Please use Google Developers Console to activate the API for your project.)

$.getJSON('https://clients6.google.com/rpc?',
        {
           "method":"pos.plusones.get",
           "id":"http://test.cuberto.ru",
           "params":{
              "nolog":true,
              "id": 'http://test.cuberto.ru',
              "source":"widget",
              "userId":"@viewer",
              "groupId":"@self"
           },
           "jsonrpc":"2.0",
           "key":"key",
           "apiVersion":"v1"
        },
        function(data){
        	var cart = JSON.parse(data.result);
        	alert(cart);
     	}
     );

What api needs to be activated?

Answer 1

It is written in English:

Access Not Configured. Please use Google Developers Console to activate the API for your project

You need to go to the Google Developers Console and enable the API that you are going to use.