Store alert – base64

{
    "version": "latest",
    "apiKey": "abcdefghijklmnopqrstuvwxyz",
    "content": [
        {
            "contentType": "alert",
            "tag": "t1",
            "content": "ewoJInZl..........ICBdIAp9Cg==",
            "contentEncoding": "base64",
            "options": {
                "expirationInDays": 30
            }
        }
    ]
}