You must be an expert in OsCommerce, this is very simple code that needed to fix. All you need to do is to fix the paypal payment because when user click the paypal button, the shipping fees does not included. Your job is to make sure to fix it, that the shipping fee must included when user click the paypal button link. You do not give access to the website. All you need to do is show me your work and send me the code in a zip drive and how will I integrate it to the website, then i will test it if it is working. You only get awarded if you are expert in oscommerce.