in common/src/main/scala/models/Provider.scala [12:17]
override def reads(json: JsValue): JsResult[Provider] = json match {
case JsString("azure") => JsSuccess(Azure)
case JsString("FCM") => JsSuccess(FCM)
case JsString("Guardian") => JsSuccess(Guardian)
case _ => JsSuccess(Unknown)
}