I i'm doing a shopping cart for selling digital products(songs).After sucessfull purchase it is sending a unique url to the buyer.they can download the song by clicking the url.
My problem is what if a customer fail to download the song completely(Due to some network problem or something else) how can i track it.i mean the customer clicks on the url then the download begins, how do i know if it is completed or not?
on going through google i found that the solution for this is use some flash or java aplet code. but i will be happy if i can handle it with php or jquery ?