If a Manual Payment has been recorded and needs to be reversed, you can now request this by calling /v3/ReverseManualPayment. This will return a 204 on successful reversal.
For example, to reverse the manual payment with the PaymentKey2NmwhRJXjHdH effective on the August 4, 2025 - make a POST request to /v3/ReverseManualPayment with the JSON payload: