Click Counter Tracking of Download of Coupons

I have coupons set up as PDF files. How can I set up a file that will keep track of each PDF this is clicked on? I need this information to show how many are download to determine a accurate count. Also helps me to know if the vendors did not keep the actual coupons—this will keep everyone honest-Thanks! Also selling point for myself to show too new customers a different way of selling their products, Thanks!

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