Write some Software

Hi there! 1. We need to develop a chrome extension that calculates profit from the price of used books on amazon: https://www.amazon.com/s/ref=nb_sb_noss_1?url=search-alias%3Daps&field-keywords=textbooks VS their price offered on Amazon trade-in (can be seen on the right after:"Trade in yours for an Amazon Gift Card up to XX$" 2. When in used&new list of offers on [login to view URL] for a specific book the extension will calculate profit, which is the difference between used price VS Amazon trade-in price offered. 3. On [login to view URL] it will calculate profit from used books prices VS [login to view URL] trade-in price. - We need the extension to be "paused" at all times, and it should be activated with one click and pause itself again. - We need to have license keys that we can generate for our costumers which they enter the key on the first time they install the chrome extension - and the license key should be limited to one use - after you used it you can't transfer. - Net profit should be calculated:Trade-in Value - (Book Price + Shipping + Estimated tax) We will provide you with a functional requirment and examples. Also, there is a working CRX that does some of the functionality - will be sent by request. Any questions - please write me back. Thanks Omer