30 days RP (Respected Prisoner) — costs $5 if purchased via stamps, or you can subscribe monthly. Monthly subscription has two tiers: Normal and VIP.
Costs $12/month and provides on a monthly basis:
Costs $40/month and provides on a monthly basis:
RP can also be purchased from other players for points via the Personal Shop (RP):
Stamps are used to purchase other upgrades. You receive bonus stamps when buying higher amounts in the same transaction.
To find out more, visit the Upgrade Shop.