Pro-rated billing

Proration splits a billing cycle by time. When a customer upgrades, downgrades, adds an item or cancels partway through, the system works out what share of the cycle is left and charges or credits only that share of the price difference. Proration is common for digital plans and memberships, where access changes immediately. For physical subscriptions, many brands skip proration and simply apply the new price from the next order, because each delivery is already a complete unit.