Customized license management

It would be nice to be able to input/upload license codes for software or products that we may sell and/or resell. I have license codes for a platform that I resell but I don't see any options to be able to provide that license to a client once purchase is complete. Another nice option would be the ability to customize the entire license code if someone wants that ability... an on/off slider option maybe. 🤷‍♀️