You already talk about the tools you use. Might as well get paid for it.
No cost to join the affiliate program — just sign up for Beat'em like anyone else.
Every account gets its own unique link, ready to find under Account > Affiliates — no application, no waiting.
Share your link with resellers you know. When someone signs up through it and joins a paid plan, you get 20% — on that plan, on every renewal, and on any credits or other payments they make, for as long as they're a customer.