function enableChat() {
    // initialize Firebase
    var config = {
        apiKey: "AIzaSyDnQLFM5Hib9_5AZIapEIVO4NSFTnRYs5E",
        authDomain: "wbd3-fap.firebaseapp.com",
        databaseURL: "https://wbd3-fap.firebaseio.com",
        storageBucket: "wbd3-fap.appspot.com",
        messagingSenderId: "655114709739",
    };
    firebase.initializeApp(config);

    const messaging = firebase.messaging();

    messaging.requestPermission()
        .then(() => {
        console.log("Permission Granted");
    })
    .catch(function(err) {
        console.log('Unable to get permission to notify.', err);
    });

    // Get Instance ID token. Initially this makes a network call, once retrieved
    // subsequent calls to getToken will return from cache.
    messaging.getToken()
        .then(function(currentToken) {
            if (currentToken) {
                var scope = angular.element(document.getElementsByTagName("body")).scope();
                scope.sendTokenToServer(currentToken);
                scope.$apply();
                // sendRegistrationToServer(currentToken);
                // updateUIForPushEnabled(currentToken);
                console.log(currentToken);

            } else {
                // Show permission request.
                console.log('No Instance ID token available. Request permission to generate one.');
                // Show permission UI.

            }
        })
        .catch(function(err) {
            console.log('An error occurred while retrieving token. ', err);

        });

    // Callback fired if Instance ID token is updated.
    messaging.onTokenRefresh(function() {
        messaging.getToken()
            .then(function(refreshedToken) {
                console.log('Token refreshed.');
                console.log(refreshedToken);
                var scope = angular.element(document.getElementsByTagName("body")).scope();
                scope.sendTokenToServer(refreshedToken);
                scope.$apply();
                // Indicate that the new Instance ID token has not yet been sent to the
                // app server.
                // setTokenSentToServer(false);
                // Send Instance ID token to app server.
                // sendTokenToServer(refreshedToken);
                // ...
            })
            .catch(function(err) {
                console.log('Unable to retrieve refreshed token ', err);
                // showToken('Unable to retrieve refreshed token ', err);
            });
    });

    messaging.onMessage(function(payload) {
        console.log("Message received. ", payload);
        var scope = angular.element(document.getElementsByTagName("body")).scope();
        if (payload.notification.title == "order"){
            scope.custId = payload.notification.body;
            scope.chat = true;
            scope.cancelFind = false;
            scope.$apply();
        } else if (payload.notification.title == "complete"){
            scope.find = false;
            scope.cancelFind = true;
            scope.chat = false;
            scope.$apply();
            scope.inOrder();
            scope.$apply();
        } else {
            scope.insertMsg(payload);
            scope.$apply();
        }
        // ...
    });

}