It is possible to receive via API the status changes (delivery confirmations, errors, etc.) of any sending. In this way, the current status and the different status changes in client software can be stored and recorded.
The configuration of the receiving URL for these state changes can be done individually in the acklevel and ackurl fields in each API request.
It can also be configured in the API configuration including a notification URL for any delivery confirmation or error. In this case, the status changes of all messages sent from the account's API or WebSMS will be received.
The way to receive the status changes is through a HTTP/GET call to a certain URL with the corresponding information (acklevel, msisdn, status, desc, subid, timestamp). More technical information in the API online description or PDF manuals.