{
  "message":{
    "to":"bk3RNwTe3H0:CI2k_HHwgIpoDKCIZvvDMExUdFQ3P1...",
    "priority":"high",
    "notification":{
      "title":"Some title",
      "body":"Some body",
      "badge":1
    },
    "data" : {
      "key1" : "val1",
      "key2" : "val2"
    }
  }
}