The Communication Center does not have the capability of sending at hour-specific times. With the Communication Center you can send out anywhere from ASAP to up to 30 days after a certain order event. The Message Triggers we support are:
Shipped - the order has left the warehouse and it is on its way to the local mailing facility which will deliver the order
Marked Out for Delivery - the mail piece receives the physical scan "arrival at unit" at the mailing facility which will deliver the mail piece (the order is about to reach the customer)
Delivered - the order has been delivered and is in the customer's possession
Returned - the order has been returned
Your messages will always send out at the correct times that you have chosen. For example, if you are sending a message 4 days after Delivery then our system will wait exactly 4 days after the time stamp of Delivered gets received from the mail carrier API.