> For the complete documentation index, see [llms.txt](https://doc.vietqr.vn/doc/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.vietqr.vn/doc/vietqr-api-china/mqtt-api-vietqr.md).

# MQTT API VietQR

销售点代码 MQTT 同步文档

**1. 目的**\
指导集成通过 VietQR 进行交易的二维码生成与使用功能，采用 MQTT 协议传输交易信息，接收余额变动通知（BĐSD），并检查交易状态。

**2. 介绍**\
VietQR 提供二维码生成能力，用于支付交易，并通过 MQTT 协议将二维码信息传输到其他系统。\
VietQR 为支持 MQTT 协议连接的设备（IoT）提供余额变动通知（BĐSD）服务。

**3. MQTT 连接设置**\
**3.2. 连接参数**


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