- add: createPushSubscription :

'Subscribed to FreePlanet.app!',
  'You can now receive Notification and Messages.'

server/models/subscribers.js

@@ -4,6 +4,8 @@ const Schema = mongoose.Schema;
 mongoose.Promise = global.Promise;
 mongoose.level = "F";
 
+const { ObjectID } = require('mongodb');
+
 // Resolving error Unknown modifier: $pushAll
 mongoose.plugin(schema => {
   schema.options.usePushEach = true
@@ -13,6 +15,7 @@ mongoose.plugin(schema => {
 const SubscriberSchema = new Schema({
   endpoint: String,
   keys: Schema.Types.Mixed,
+  userId: String,
   createDate: {
     type: Date,
     default: Date.now