> You just make it so that anything behind a paywall requires adding the license key which is generated by Gumroad upon purchase and later verified via their li

> You just make it so that anything behind a paywall requires adding the license key which is generated by Gumroad upon purchase and later verified via their licenses API. This is what I did. I also had to create a licensing backend to handle cases such as only being able to use your license key on a single account, and for verifying that your license key was still valid (in case you cancelled or got a refund).