To use the Push status feature you will have to host a application web page that our client can call using http get. The following information explains how the system works and how configure push message status within out system.
Note that to understand if the message has been accepted by the gateway is recommend that you do one messages status query. It is recommended that is done not sooner that 1 sec after the send process. If done earlier you get a -230 error saying the document Id does not exist. If you do get this error you can repeat the request until a non error response is returned. (assuming you are quering the correct documentId under the correct username and pw)
Add new push API for sending delivery status change to the customer:
...