我試圖通過Firebase雲功能發出通知，但我的代碼沒有給出任何通知

我已經完成了身份驗證觸發器，它工作正常。如果有人刪除了他們的賬戶，我需要發送通知「這個用戶刪除了他的賬戶（電子郵件）」。這裏是我的代碼我試圖通過Firebase雲功能發出通知，但我的代碼沒有給出任何通知

const functions = require('firebase-functions') 

//initialize the app 
const admin = require('firebase-admin') 
admin.initializeApp(functions.config().firebase) 

const ref = admin.database().ref() 

//create user account function 
exports.createUserAccount = functions.auth.user().onCreate(event => { 
    const uid = event.data.uid 
    const email = event.data.email 

    const newUserRef = ref.child(`/UserNotify/${uid}`) 
    return newUserRef.set({ 
     email: email 
    }) 
}) 

//delete user account function 
exports.cleanupUserData = functions.auth.user().onDelete(event => { 
    const uid = event.data.uid 
    const userRef = ref.child(`/UserNotify/${uid}`) 
    return userRef.update({isDeleted: true}) 
}) 

function sendNotification() { 

    console.log("Successfully sent"); 

    var payload = { 
     notification: { 
      title: "User get deleted", 
      body: "[email protected]" 
     } 
    }; 

    admin.messaging().sendToDeveice(payload) 
     .then(function (response) { 
      console.log("Successfully sent message:", response); 
     }) 
     .catch(function (error) { 
      console.log("Error sending message:", error); 
     }) 
}

來源

2017-07-27 HemalHerath