Plesk

Available Licensing Models – Freemium Extensions

A freemium extension provides some of its functions free of charge,
using these functions requires no installed license. Access to full
functionality of such an extension, however, requires a license to be
purchased and installed.

License status Extension behavior requirements
License installed All extension’s functions are available
License not installed
  • Extension’s “free” functions are available;
  • Controls and screens pertaining to extension’s “premium”
    functions are visible to users but are disabled;
  • Attempts to access extension’s controls and screens
    pertaining to its “premium” functions result in displaying a
    “License required” message.

“License required” message example:

"This functionality is available only in the paid version of the %%extension_name%% extension. You can purchase the license <a href="%%buy_url%%">here</a>."

Here, %%buy_url%% is the URL of the corresponding online store that
sells the said license. This URL must be obtained from the extension’s
metadata. Refer to the section Obtaining the Online Store URL
Correctly
for instructions.

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