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i need to create a php page that allow download one file only one time and with a secret code.
I will distribuite the code (like a reedem itunes code) to my customer and they can go to this page, insert his code and downoad the file.
In another page i need to see the full list of codes with the date when the code has been used and enable or disable every code.
No user management, no mysql (sqlite or plaintext)