hashing wallet id from notification

lib/pushnotificationsservice.js

@@ -10,6 +10,7 @@ var fs = require('fs');
 var path = require('path');
 var Utils = require('./common/utils');
 var Model = require('./model');
+var sjcl = require('sjcl');
 var log = require('npmlog');
 log.debug = log.verbose;
 
@@ -123,7 +124,7 @@ PushNotificationsService.prototype._sendPushNotifications = function(notificatio
               "data": {
                 "title": content.plain.subject,
                 "message": content.plain.body,
-                "walletId": notification.walletId,
+                "walletId": sjcl.hash.sha256.hash(notification.walletId),
               }
             };