Let's say If a customer wants my solution then he has to register in my application after registration customer will get some license key and then before installing that solution customer must enter that license key somewhere let's say in configuration page only after that validation he will be allowed to install that solution in his environment.
But my problem here is Configuration will page is not a mandatory page which means it's up to the customer whether he wants to validate or not but I want the customer to validate his license key before installation. I don't want the customer to install my solution into multiple environments though he has registered for only one.
