Hi Mike,

You can expire web notifications sent via the API by using the time_to_live web override object in the request.

Below is an example payload:

{
    "audience": "all",
    "device_types": [
        "web"
    ],
    "notification": {
        "alert": "This message will expire in 60 seconds.",
        "web": {
            "time_to_live": 60
        }
    },
    "options": {
        "expiry": 60
    }
}