You clearly were not ready for production. Please take your SaaS product offline and fix it.
1) A Recursion vulnerability exists within your app - if I use your PHP sample code to take a a screenshot of itself, your service blows up.
2) You embed a fully usable API key and token in your landing page. Line 254 and 255: var urlPart = "apikey=6101EE5C99B145ECB79B4125BED74D19&url=" + $('#tryurl').val() + "&thumbnail_width=550&crop_height=440&width=1280&height=1024"; var token = calcMD5(urlPart + "9A8E44104F064A5B9AD410F0F2DC9558");
You might want to fix that.