PHP Amazon UPC Code to ASIN API Custom Script Needed...

Hello, I need a custom PHP script made where I can input a bulk list of UPC codes (100,000 UPC codes at a time) and it checks Amazon's API to see if there are any associated products with each corresponding UPC code. Here is how the script should function: - I will access the script on my web server and enter the list of 100,000 UPC codes. Then I will click a button that says process and the system will begin running. Once the UPC codes have been loaded into the system, the script should process without the need to have the window open. I will then close the browser window and the system will continue to run until it is complete. - Once the process is complete, the system will then send an email to me with a download link to download an excel XLSX file. Note: the file must be XLSX since the XLS limitation is at 65,536 rows and we need the file to output 100,000 rows of data. - Once I open the excel file, in the A column will be the UPC code number and in the B column will be the Amazon ASIN#. If there is no data for a particular UPC code, it will leave column B blank. Please see the file attachment so you can see an example of what we need as the final product. Please note: We already have a system that does exactly this. It was made years ago and for some reason it does see all of the Amazon ASIN#'s. Our existing system was not built for quality as much as it was built for speed. We need this new script to be able to check Amazon's API for ALL countries worldwide. We want to work with someone who has experience with Amazon's API so they can see any problems before they may arise. If you have any questions or need any clarification, I would be more than happen to clarify and/or discuss. We are looking for pay $250 at the very most to have this completed and we need this done within 24-48 hours. We will load 100% of milestone upon accepting the winner. Then upon project completion, we will release the milestone as usual. Please also leave a custom message when bidding so we know that you have read the project description. We will not consider working with copy/paste bidders. Thank you!