SMS Delivery callbacks will be sent to the address you specify in SMS manager via HTTP or HTTPS POST.
Fields sent will consist of:
[action] => smscallback
Static, always contains this value. Useful for multi-purpose callback scripts.
[uid] => [Number]
This will be the unique ID of the SMS that was returned when the message was originally sent.
[status] => 0
Status will be one of:
0 – Queued (generally won’t receive this)
1 – Sending
2 – Sent
3 – Error
4 - Received
[error] => [Error Message]
Only sent when status is 3. Contains verbose error message
[completetime] => [Date & Time]
Date and time the action was completed (YYYY-MM-DD HH:MM:SS)