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The best place to start if you need help with a specific product is to contact the developer. All WHMCS Marketplace developers have both a website and support URL listed.
Build, License & Distribute Your Own Apps using WHMCS
Generate, distribute and validate license keys
This addon allows your to add html / php to the header / footer in the admin area / admin login page / clients area
This module allows you to alter the language strings used throughout WHMCS.
Simple and easy way to debug your current page (defined constants, request variables, queries)