Purchases and Completions can be voided the same day that they occur (prior to Batch Close). A Purchase Correction transaction amount must be the same as the original transaction. Purchase Correction transactions should be sent using the original transaction’s Order ID and the Transaction Number returned in the original transaction response. When using the default automated closing feature, Batch Close occurs daily between 10 – 11 pm Eastern Time.
Go into configs to add credentials if they aren't there.