Single use access/invitation code for download

  • I’m hoping there’s a plugin to do what I need, but haven’t had any luck finding one. Any suggestions are welcome.

    This is the scenario:
    * Flyers are being printed with unique codes on them.
    * The code gives users access to a free download from the website.
    * The codes can only be used once each.

    Any ideas how to do that?

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