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You can cancel a PaymentIntent object when it’s in one of these statuses: requires_payment_method, requires_capture, requires_confirmation, requires_action or, in rare cases, processing.

After it’s canceled, no additional charges are made by the PaymentIntent and any operations on the PaymentIntent fail with an error. For PaymentIntents with a status of requires_capture, the remaining amount_capturable is automatically refunded.

You can’t cancel the PaymentIntent for a Checkout Session. Expire the Checkout Session instead.