Hi Guo,
You can send text messages to the users in multiple ways explained below.
- Using Push Notification - you can send push notification using PushNotification Service to the users. More details for PushNotification Service, please visit http://api.shephertz.com/app42-docs/push-notification-service/
- Using Buddy Service - You can send message using Buddy Service to the users. For more details for Buddy Service, please visit http://api.shephertz.com/app42-docs/buddy-management-service/
Message/Queue - You can send messages using Message/Queue Service to the users. For more details for Message/Queue Service, please visit http://api.shephertz.com/app42-docs/message-queue-service/