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If you want to use the dedicated module page, which is available under https://yourdomain.com/index.php?m=supportpin, you need to add an menu entry.
An example hook to add the menu entry is included in the module package.
On WHMCS v6 or above a sidebar widget is available, therefore you do not need to add a link to the module page.
At the module configuration you choose via a dropdown between 2 different sidebar themes:
