Write some software -- 3

I need you to develop some software for me. I would like this software to be developed using Python or anything else. Hi, Im a ebay to amazon dropshipper. I want a simple software or Google chrome extension to help me monitor price and stock change. This is basically how it should work:  1. After I list a product, I will enter item id from ebay and Amazon asin number into the software.  2. I will enter the profit margin inside the software.  3. The software will automatically change price on the eBay items which price change on amazon according to my profit margin.  4. Software will put stock to zero when the item goes 1 on amazon.  5. I can bulk edit profit margin for all my listing. 6. I want the software or chrome extension to be undetectable to eBay so eBay doesn't know I'm a drop shipper and I'm using amazon as supplier. I want a simple software. Thank you Harun