eBay Motors API Developer Needed for ebay motors -- 2

I need an experienced ebay API developer to make me a software that would make it easy for me to upload 1000's of listings at a time and to manage them all from a single platform. * will only respond to bidders that have ebay api experience based on their reviews and that do not copy and paste their response to this job. We list in the following ebay motor categories: ebay motors>parts & accessories>car & truck parts>wheels, tires & parts : 66471= tires 66479= wheel and tire packages 33749= wheel lugs 43953=wheels 179696=tire pressure monitor systems ***has to be web based*** 1. excel template provided by developer for product upload should contain item specifics,specs, conditions etc per category. 1 excel template per category. 2. Submit/automate listings through excel (must be able to upload 1000's of product listings with no errors in software) 3. get information of current listings 4. since i am planning to upload 1000s of products, how can i mass edit, incase i need to edit 100s of listings at a time? give me options please 5. i need to be able to see order, and next to each order if item has been paid or feedback left by customer and option for me to leave feedback. 6. be able to receive/send messages **development has to be completed in max 20 days