Open @SurfingVpnBot -> 💳 Подписка (Subscription) -> Купить подписку (Buy subscription), choose a plan and duration, and pay.
When picking a plan its description is shown: available locations, traffic limit, device limit and payment type. Payment is usually one-time, no auto-charges.
Current plans, locations and prices are always in the bot — the plan list keeps growing.
After payment access activates automatically; the subscription in Happ updates itself (or tap the refresh icon).