Amazon API Expert - Importing into Prestashop

We are developing a large green shopping site that uses the Amazon API to import all our products. Someone else has developed a script, but keeps making excuses to get it working right. It is mostly working but it is not done and we are launching our stie in 2 days. Some of the issue are a lot of amazon products are coming back with a $0 price for some reason. We are also having problems getting amazon to recognize negative keywords such as -apple the negative keywords work fine on Amazon, but seem to fail when we import. Also getting our shopping cart to send info to amazon. We are an Amazon Associate. This is an hourly job, you can also bid on these minor changes, but there will be more aspects and it is crazy to bid for every little thing, or bid on this, then hourly. The programmer that you will work with is from India. Don't respond unless you are truly and expert with the Amazon API. Also if you now how to customize or write modules etc for Prestashop that is a bonus. This is a priority job that has to be completed in the next 24 hours or you won't get paid. I have had problems with people not meeting deadlines and we are launching in 2 days! Thanks