API V2 Beta Documentation

New to Authorization Token (and also new to Javascript.) Any easy way to put in subject_id and return the real character?

var v2key = 'XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX';
    var url = 'https://www.wanikani.com/api/v2/';
    var path = 'assignments';
    var id = '?srs_stages=9';
    $.ajax({ // ajax call starts
        url: url + path + id,
        dataType: 'json', // Choosing a JSON datatype
        method: 'GET',
        headers : { 'Authorization' : 'Token token={' + v2key + '}' },
    })
    .done(function(data) {
        console.log(data);
        debugger;
        for(i=0; i< data.data.length; i++){
            id = '/' + data.data[i].data.subject_id;
            path = 'subjects';
            $.ajax({ // ajax call starts
                url: url + path + id,
                dataType: 'json', // Choosing a JSON datatype
                method: 'GET',
                headers : { 'Authorization' : 'Token token={' + v2key + '}' },
            })
            .done(function(data2) {
                console.log(data2.data.character);
                //$('col-md-9').append(JSON.stringify(data, undefined, 2) + '<br>');
            }).fail(function(err) {
                console.error(err);
            });
        }
    }).fail(function(err) {
	  	alert(err);
	});

It seems like if I request too much, there is error, and the request stops working.

Rather, I might even ask, what knowledge is required?