Another year of updates.
Your license doesn’t expire and isn’t affected by this. What a renewal buys is the next year of new versions, including any published since your window closed.
Check out with the email address you bought Snapline with. A renewal extends the license held under that address — it isn’t a license of its own. Bought under a different address, there is nothing to extend, and we refund it rather than issue a second license.
Payments by Paddle · Apple Pay & cards · 30-day, no-questions refunds
Nothing to enter afterwards. It is the same license with a longer window, so every Mac you have activated stays activated — Snapline picks the new date up the next time it checks for updates. The renewal email carries the key again if you would rather not wait.