Hello, World

发送及接收信息和事件是代理与用户间沟通的核心环节。代理通过 Business Messages API 向用户发送信息、事件和请求，但通过网络钩子以 JSON 格式接收用户创建的信息和事件。

下面是一个对话流程示例，它使用示例数据来说明信息、事件和请求如何形成有用且有意义的互动。

在此示例中，用户发起对话并发送“Hello, I'm World!”信息，然后代理回复“Hello, World”。

1. 用户发起与代理的对话。

2. 用户开始输入回复后，会向代理发送输入事件。

   {
     "agent": "brands/1111/agents/2222",
     "conversationId": "3333",
     "customAgentId": "hello-world-bot",
     "requestId": "1234567890",
     "userStatus": {
       "isTyping": "true",
       "createTime": "2020-10-02T15:01:23.045123456Z",
     },
     "sendTime": "2020-10-02T15:01:24.045123456Z",
   }
   

3. 用户发送“Hello, I'm World!”信息。

   {
     "agent": "brands/1111/agents/2222",
     "conversationId": "3333",
     "customAgentId": "hello-world-bot",
     "requestId": "123123123",
     "message": {
       "messageId": "4444",
       "name": "conversations/12345/messages/67890",
       "text": "Hello! I'm World!",
       "createTime": "2020-10-02T15:05:23.045123456Z",
     },
     "context": {
       "entryPoint": "PLACESHEET",
       "userInfo": {
         "displayName": "Michael",
         "userDeviceLocale": "en",
       },
       "resolvedLocale": "en",
     }
     "sendTime": "2020-10-02T15:05:24.045123456Z",
   }
   

4. 代理发送“Hello, World”信息。

   curl -X POST "https://businessmessages.googleapis.com/v1/conversations/3333/messages" \
   -H "Content-Type: application/json" \
   -H "`oauth2l header --json path/to/service/account/key.json businessmessages`" \
   -d "{
       'messageId': '5555',
       'text': 'Hello, World',
       'representative': {
         'avatarImage': 'https://hello.world/avatar.jpg',
         'displayName': 'Hello World Agent',
         'representativeType': 'BOT'
     }
   }"
   

5. 信息送达后，用户的设备会返回递送回执。

   {
     "agent": "brands/1111/agents/2222",
     "conversationId": "3333",
     "customAgentId": "hello-world-bot",
     "receipts" : {
       "receipts": [
         {
           "message": "conversations/3333/messages/5555",
           "receiptType": "DELIVERED",
         }
       ],
       "createTime": "2020-10-02T16:01:23.045123456Z",
     },
     "sendTime": "2020-10-02T16:01:24.045123456Z",
   }