# Page Not Found

The URL `tai-lieu-tich-hop/loai-hinh-dich-vu-app-to-app` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [Thanh toán App to App](https://developers.vinid.net/tai-lieu-tich-hop/dich-vu-thanh-toan-vinid-pay/loai-hinh-dich-vu-app-to-app.md)
- [Môi trường tích hợp](https://developers.vinid.net/tai-lieu-tich-hop/moi-truong-tich-hop.md)
- [Dịch vụ chi hộ](https://developers.vinid.net/tai-lieu-tich-hop/dich-vu-thanh-toan-vinid-pay/loai-hinh-dich-vu-b2c-transfer.md)
- [Thanh toán Transaction QR](https://developers.vinid.net/tai-lieu-tich-hop/dich-vu-thanh-toan-vinid-pay/loai-hinh-dich-vu-transaction-qr.md)
- [Thanh toán Web Payment](https://developers.vinid.net/tai-lieu-tich-hop/dich-vu-thanh-toan-vinid-pay/loai-hinh-dich-vu-web-payment.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://developers.vinid.net/tai-lieu-tich-hop/dich-vu-thanh-toan-vinid-pay/loai-hinh-dich-vu-app-to-app.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://developers.vinid.net/sitemap.md

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

### Option 3 — Retrieve the full documentation corpus

Full export: https://developers.vinid.net/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., `/tai-lieu-tich-hop/dich-vu-thanh-toan-vinid-pay/loai-hinh-dich-vu-app-to-app.md`).

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