When a customer switches between subscriptions within the same level. If the in-app purchases are of the same duration, the customer’s prorated amount from the introductory offer is refunded to the original payment method. The new in-app purchase is charged and goes into effect immediately at the full price, which changes the customer’s renewal date to the crossgrade date. If the in-app purchases are of different durations, the crossgrade goes into effect on the customer’s next renewal date.