When a membership is canceled the system does not automatically prorate the membership based on its expiry day.

💡If a customer's billing date is the 17th of the month and their expiration date is the 20th of the month, a full payment is still scheduled.

If you're looking to provide a prorated amount for customers that have canceled this can be done by adjusting their upcoming membership amount: Adjust an upcoming payment for a customer

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​Adjust an upcoming payment for a customer
​How to skip membership payments
​Cancel a pending payment (GoCardless)