Add a developer license
Add the ability to create a free developer license to the purchased ISPsystem product license.
For example, I want to create a custom extension for BILLmanager. I can't test that extension on the production environment. I need another environment where I can test my extensions in BILLmanager. However, an additional license is required for this. This license should be free to BILLmanager license and taught for testing purposes only.