Simple API to direct feed to Amazon MWS using my distributor API MWS fields

I have about 20 fields from my distributor that needs to integrate with Amazon MWS. So, I would need an XML file created and probably a Java or PHP to call that XML file. Also to run when I need it to run. I need someone that has experience in doing this. I need someone that has already done this. I have hired 2 guys already from Freelancer that have failed to complete the project that wasted my time for more than a month. I have included my distributor file which includes the fields. I don't want to use a flat file. My main goal is to update quantity, but I would also like to add and update products as well. Maybe 2 different feeds. I would also like the code. Updating the pricing is not necessary because it would be at my cost and I am not selling parts at cost. Only respond if you are able to do this and have had experience at doing this in the past? I have had several projects from fiverr and they delivered each time and haven't had anybody deliver from freelancer yet! I have a budget I would like to stay at because this is what it was before of $110. thanks [login to view URL]