Problem Regarding Ecommerce APIs

Question

Hi Guys,<br /> <br /> I am stuck in some problems regarding the uses of APIs.<br /> my task is to upload single/Bulk product over Ebay and Amazon using their APIs, I got lots of APIs as well but I didn't the accurate way to implement that thing if anyone have any GUI kind of sample or having any idea how to accomplish desire task, then let me know.<br /> and if anything that you don't understand properly than also let me know.<br /> Thanks in advance