A single license removes trial limits in the ss-print desktop app so you can generate and watch the full meet. You do not have to use Stripe: enable whichever checkout links you already have (Stripe, PayPal, GoCardless) by setting the matching NEXT_PUBLIC_* URLs in .env.local.
Your price
Use hosted links from each provider (fastest), or later add server-side Checkout APIs. Automated delivery (email with a key) belongs in each provider's webhook handler — see README.md.
After purchase, customers follow the steps on Activate.