Applyra grows through developers telling other developers, so that is now worth something on both ends.
Every account has a referral link. Someone who subscribes through it gets half off their first month. Once their subscription has held, a $9.99 credit lands on your account, which is one free month, applied to your next invoice automatically. No affiliate dashboard to negotiate, no payout threshold, no form.
The credit waits for the subscription to prove itself rather than paying out on signup, which is the only way a referral program stays viable for a tool that costs less than a lunch.
Your link, who used it, and where each referral stands are on the Referrals page in the dashboard.