Need to fix PHP code for shipping quotes via API

Need to customise shipping on an Oscommerce webshop so that shipping is based on the number of parcels, their weight and measures. This has to be done through an API of a shipping agent. However, the number of products in the shopping cart is not always the same as the number of parcels as some products are shipped in more than one parcel. The weight and measures of each parcel are always constant and product-specific. I need to store this information for each product in the catalogue so that the number of parcels, their sizes and weight is correct and according to what the client has selected in the shopping cart. You would be working in a highly customised Oscommerce live webshop so you must take back ups and being extremely careful that nothing goes wrong as the site is live. You need: - To be a native and fluent English speaker - To have access to gmail and being able to use gmail chat facility - To be able to complete this project in the next 26 hours Contact me asap if you need more details. Thanks