The best mobile app development platforms allow you to build feature-rich, attractively designed apps with little or no programming skills.
A push notification is an unprompted message that is delivered from a remote server and pushed to a mobile device. Technology giants Apple deliver their push notifications through Apple Push Notification Service (APNS). Conversely, Android utilise the Google Cloud Messaging (GCM) to deliver push notifications to android devices. Most Windows push notifications are received through the modernised WNS framework.雇佣Push Notification Developers
Trading web app, It is the app that users trade (buy & sell) their point each other. App does not need admin page to trade, it is other website that they are trading. Once buyer and seller want to trade (the buy / sell button pressed) they will know by push notification.