Do I need an API key?
No. This sales page is built around your current local-compression workflow, so the plugin experience feels simple and fast.
How many sites can I activate?
Each paid license is framed as 1 site plus 1 bonus site, which is the same as allowing activation on 2 sites total.
What happens if someone cancels?
Your custom license system can keep access active through the paid period, then disable premium compression once the subscription expires.