WHMCS API - standalone php file that is the order form

============ The HTML we will provide, all is need the php work and Ajax work to comunicate with WHMCS API to submit the form and check domain and apply the functionality that is below. WHMCS IS setup, Server is setup. Intro file that has the connection to WHMCS API is also setup. The product in WHMCS are also setup with custom fields. ========= Here is full project description in details on what is needed. Custom Order Form for WHMCS billing system, must use PHP, AJAX, Javascript. The custom order form needs to have from 3-8 steps. (Must work as a php shopping cart and display the content of the cart along with the total price) Step 1. Display packages that are in the 2 WHMCS Group (Our Internal Product | Our Services). (We only display the two groups products in step 1) For the "Our Internal Product" Group When the client select a package we should also define the custom fields and pass it via the sign up because a specific custom field launches automatic WP install. For the "Our Services" The service product does not need step 2,3, 4 and 5, it bypass and goes to step 6. Our service is for client to buy a service like: Install a SEO plugin, Update the logo etc. One step 6 the client is asked to login in, the register is not asked as the services are only able to purchase if they have bought a hosting with already. if the client is trying to login with an account that does not exist. that we inform with alert saying : this account does not exsits, either click forgot password or to buy this service you can only if you have purchased a hosting package with use. Full project info here: [login to view URL]