A Yaff page is live as soon as you sign up. You can share yaff.io/yourname immediately, then add a photo, bio and payouts when you are ready to charge.
Memberships are monthly subscriptions you define. Each tier has a name, price, currency and optional perks. Yaff syncs the price to Stripe on your connected account when you save.
Branding controls exist for every creator. A custom domain (yourname.com) is not implemented, on Pro or otherwise.
