You earn a free month of Circleback for each person who joins through your referral link or meeting notes emails. The referral tracking for meeting notes emails is done automatically and works for emails sent automatically or manually.
You can get your referral link and see how many free months you've earned from Settings → Billing. You'll also receive an email each time you earn a free month through a referral.
If you're part of a team, each referral earns your team a free seat for a month.