You can cancel / void an ACH Credit or Debit prior to the ACH batch processing cut off time with an ACH Void.

The following parameters are available to process a ACH cancel / void.

parameter	description	required
mid	the Merchant ID (MID) assigned by `{user.company_name}` or your merchant service provider (MSP)	Yes
reference_id	A reference id that will be echo'd back in the message response.	No
transaction_id	the payment gateway unique transaction_id for the original ACH Credit or Debit	Yes

Links to details on related response codes.