convert single page php code into javascript

I have with me a script for sending/updating/deleting order data to FastSpring through API (FastSpring is a PayPal alternative). Now, this script is in PHP- I want you to convert it into javascript code- something similar to the many paypal js libraries that are available. I also have with me a javascript based shopping cart- I want you to integrate the new js payment class with this shopping cart- so that I can place orders to FastSpring using the js shopping cart. The secret key/credentials used to actually connect to FastSpring should be completely secure and not accessible by hackers or anyone else. Please take a look at the PHP file (for Fastspring functions) that is at [login to view URL] . Also you can get the shopping cart (js) at [login to view URL] I have an HTML/CSS template and a blogger template for the same design with me- you will also have to make modifications to this design- eg to show multiple products or single product on one page- so that the same design is used for website and shopping cart (which you are working on for this project) When your work is complete, I should be able to define custom products with custom attributes (these values should be stored in xml or other files)... Your code should show the appropriate product to the client, then send the product data to the client. A simple calculator feature for use within one product at a time in js is also required- one product can have multiple configurable features, and a per unit price can be set for each feature- now user selects 'x' number of units of one feature and 'y' number of units of another feature, and the calculator calculates the price for that custom product. Simple work for a good js programmer. Regards, Arvind. Regards, Arvind.