# Page Not Found

The URL `vi/api-nang-cao/vietqr-payment-mqtts/cac-buoc-dong-bo-mqtt` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [Các bước đồng bộ MQTT](https://api.vietqr.vn/vi/cac-dich-vu-api-khac/api-host-to-device-mqtts/cac-buoc-dong-bo-mqtt.md)
- [Tài liệu đồng bộ mã điểm bán MQTT](https://api.vietqr.vn/vi/cac-dich-vu-api-khac/api-host-to-device-mqtts/tai-lieu-dong-bo-ma-diem-ban-mqtt.md)
- [MQTT Nhận Biến Động Số Dư](https://api.vietqr.vn/vi/cac-dich-vu-api-khac/api-host-to-device-mqtts/mqtt-nhan-bien-dong-so-du.md)
- [MQTT Tạo Mã Thanh Toán VietQR](https://api.vietqr.vn/vi/cac-dich-vu-api-khac/api-host-to-device-mqtts/mqtt-tao-ma-thanh-toan-vietqr.md)
- [MQTT Tra Cứu Thông Tin Giao Dịch](https://api.vietqr.vn/vi/cac-dich-vu-api-khac/api-host-to-device-mqtts/mqtt-tra-cuu-thong-tin-giao-dich.md)

## How to find the correct page

If the exact page cannot be found, you can still retrieve the information using the documentation query interface.

### Option 1 — Ask a question (recommended)

Perform an HTTP GET request on the documentation index with the `ask` parameter:

```
GET https://api.vietqr.vn/vi/cac-dich-vu-api-khac/api-host-to-device-mqtts/cac-buoc-dong-bo-mqtt.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

### Option 2 — Browse the documentation index

Full index: https://api.vietqr.vn/sitemap.md

Use this to discover valid page paths or navigate the documentation structure.

### Option 3 — Retrieve the full documentation corpus

Full export: https://api.vietqr.vn/llms-full.txt

Use this to access all content at once and perform your own parsing or retrieval. It will be more expensive.

## Tips for requesting documentation

Prefer `.md` URLs for structured content, append `.md` to URLs (e.g., `/vi/cac-dich-vu-api-khac/api-host-to-device-mqtts/cac-buoc-dong-bo-mqtt.md`).

You may also use `Accept: text/markdown` header for content negotiation.