get http://sampleapi.readme.io
Authentication requires a key, which can be acquired from the dashboard. You will need to include your key in every request:
$.get('http://sampleapi.readme.com/orders/', {key: '[[app:key]]'}, function(data) {
alert(data);
});
The key can be passed via the headers OR via a query param. If you're posting, you can include it in the data being posted.