The key 'expiry' is not allowed in this context

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HI Team,

"Expiry" key not working for android Json. I am using below json for api calling :

URL : https://go.urbanairship.com/api/push

JSON for POST Request :

{
"audience":
{
"android_channel":["9c36e8c7-5a73-47c0-9716-99fd3d4197d0"]

},
"notification":
{
"android":
{
"extra":
{
"screenName": "Test",
"projectName":"Test-Project"

},
"alert":"Updated : TestActivity",
"title":"Milestone",
"sound":"true",
"expiry":"2018-03-15T20:15:30"
}
},
"device_types":"all"

}

Response : Please see the below error response .

{
"ok": false,
"error": "Could not parse request body.",
"error_code": 40000,
"details": {
"error": "The key 'expiry' is not allowed in this context",
"path": "notification.android.expiry",
"location": {
"line": 21,
"column": 16
}
},
"operation_id": "39adb731-aa1d-4e18-ac4c-1da617a0c58a"
}