Takes money that a pre-authorisation holds on the customer's card. You can capture all of the hold or part of it.

• Applies to: a successful pa (pre-authorisation) that hasn't been captured or reversed, on an order created with pa_only: true.
• Partial captures: send an amount lower than the hold. capturable_amount on the pa shows how much you can capture.
• Afterwards: the capture is a new cp payment. Its original_reference_id is the pre-authorisation's original_id. The pa stays in the list.
• To give money back after a capture, refund the cp payment. You can no longer reverse the pa.

To release the hold without taking any money, reverse the pre-authorisation instead.