Zero Dollar Payments in Iepxense

How are other companies handling I expense payments to suppress zero dollar payment notifications to the end user?

When our payables group processes Amercian Express payments, a zero dollar payment notification goes to the requestor and the actual payment gets wired to Amex.

 Is there a way to suppress the zero dollar payment notifcation to the end user. In some cases, some of our users receive 20 - 30 notifications of zero dollar payments and they are complaining about it.