Cancel or change the payment method for your AppleCare plan - Apple Support
If you cancel your AppleCare plan more than 30 days after your purchase, you’ll get a refund based on the percentage of unexpired AppleCare plan coverage, minus the value of any service already provided.1
1. The refund guidelines might vary in your country, region, state, or province. You can find more information about canceling and refunds in the applicable AppleCare Terms and Conditions. If you pay monthly for AppleCare+ from your wireless carrier, contact the wireless carrier to request a refund.