What feature should Pomodoro use to ensure a seamless transition for a customer changing from a monthly to quarterly subscription?

The most appropriate feature for Pomodoro to use when facilitating a seamless transition for a customer changing from a monthly to a quarterly subscription is proration. Proration allows the service to calculate the amount the customer has already paid for their monthly subscription and make adjustments to reflect the new quarterly subscription start date, ensuring that they are only charged for the remaining days of the monthly subscription.

By implementing proration, Pomodoro can provide a smooth customer experience, as the billing will automatically adjust to account for the difference in pricing and duration between the two subscription plans. This eliminates confusion and ensures that the customer feels that they are being treated fairly, as they will receive credit for any unused time from their monthly plan towards the quarterly subscription. This feature is crucial in subscription management because it maintains customer satisfaction and loyalty during transition periods.