diff --git a/CloudFunction.js b/CloudFunction.js
new file mode 100644
index 0000000..46984e9
--- /dev/null
+++ b/CloudFunction.js
@@ -0,0 +1,75 @@
+'use strict';
+
+const functions = require('firebase-functions');
+const admin = require('firebase-admin');
+admin.initializeApp ({
+    credential: admin.credential.applicationDefault(),
+    databaseURL: 'https://your-DB-URL.firebaseio.com'
+});
+
+
+exports.fetchContacts = functions.https.onRequest((request, response) => {
+
+    const preparedNumbers = request.body.data.preparedNumbers;
+    var users = [];
+
+   return Promise.all(preparedNumbers.map(preparedNumber => {
+        return admin.database().ref('/users').orderByChild("phoneNumber").equalTo(preparedNumber).once('value').then(snapshot => {
+            if (snapshot.exists()) {
+                return snapshot.forEach((childSnap) => {
+                    const uid = childSnap.key;
+                    var userData = childSnap.val();
+                    userData.id = uid;
+                    users.push(userData);
+                })
+            }return null;
+        })
+    })).then(() => { 
+        return Promise.all([response.send({data: users})]);
+    }); 
+});
+
+exports.sendGroupMessage = functions.database.ref('/groupChats/{chatID}/userMessages/{messageID}').onCreate((snap, context) => {
+
+    const chatID = context.params.chatID;
+    const messageID = context.params.messageID;
+    var lastMessageID = "";
+    const senderID = snap.val();
+
+    return admin.database().ref(`/groupChats/${chatID}/userMessages`).orderByKey().limitToLast(1).once('child_added').then(snapshot => {
+      
+        lastMessageID = snapshot.key;
+
+       return admin.database().ref(`/groupChats/${chatID}/metaData/chatParticipantsIDs`).once('value').then(snapshot => {
+            let members = Object.keys(snapshot.val());
+           return members.forEach(function(memberID) {
+              if (memberID !== senderID) {
+                sendMessageToMember(memberID);
+                incrementBadge(memberID);
+                updateChatLastMessage(memberID);
+              }
+            });
+        });
+    });
+
+    function sendMessageToMember(memberID) {
+        let userMessagesReference = admin.database().ref(`/user-messages/${memberID}/${chatID}/userMessages`)
+        userMessagesReference.update({
+           [messageID] : senderID
+        });
+    }
+
+    function updateChatLastMessage(memberID) {
+        let userMessagesReference = admin.database().ref(`/user-messages/${memberID}/${chatID}/metaData`)
+        userMessagesReference.update({
+            "lastMessageID": lastMessageID
+        });
+    }
+
+    function incrementBadge(memberID) {
+        let badgeReference = admin.database().ref(`/user-messages/${memberID}/${chatID}/metaData/badge`)
+        badgeReference.transaction(function (currentValue) {
+            return (currentValue || 0) + 1;
+        });
+    }
+});