Settings → Membership Plans → New plan. Pick "Class pack" for a fixed credit bundle (drop-in, 5-pack, 10-pack) or "Unlimited pass" for date-boxed unlimited access (monthly, quarterly, annual).
Credit packs burn one credit per check-in and expire on the date you set (or "no expiry"). Unlimited passes never burn credits — they just cover any booking inside the window.
Members buy either from the mobile app; the checkout uses your gym's Authorize.net or Stripe. Refunds and gifting come from the member's Billing tab on their profile.