Can anyone suggest an online course or a book that would teach me how to build a back end system that would allow me to send buyers to a download link to download ebooks and then record the isp and time of download, and then change the download link so that it doesn't get passed on to others who have not paid?
Currently, I send all ebook orders via email. Been searching for some time for a step by step guide but have had no luck in finding anything.
Thanks In Advance
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