It would be really useful to have the ability to clear-down a notification some time after it was first raised.
This could be done by returning a unique GUID when the message is posted, and then using that GUID in a subsequent API call to clear-down the message.
The individual clients (phone, tablet, etc) could have the option to permit messages to be remotely cleared-down, or to retain them if desired.
Please please please implement this, it would be a game changer. I understand android and IOS notifications may present challenges with this, as I imagine it could be difficult to remove a notification that has already fired on a handset, but even if you could only show the update in the app it would be a game changer. 90% of the notifications I have going through Pushover, already have an associated "cleared" notification with them, for when the alert no longer requires action, but they are so hard to tie together visually. This is the *only* issue I have with Pushover, otherwise I love it, but unfortunately this item alone is making me look for alternatives.
