# Page Not Found

The URL `integration-options/checkouts/using-the-checkout-identifier` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [Checking out guest and registered customers](https://docs.digitalriver.com/digital-river-api/integration-options/checkouts/creating-checkouts/using-the-checkout-identifier.md)
- [Building checkouts](https://docs.digitalriver.com/digital-river-api/integration-options/checkouts/creating-checkouts.md)
- [Tax identifiers](https://docs.digitalriver.com/digital-river-api/integration-options/checkouts/creating-checkouts/tax-identifiers.md)
- [Providing an upstream identifier](https://docs.digitalriver.com/digital-river-api/integration-options/checkouts/creating-checkouts/providing-an-upstream-identifier.md)
- [Handling completed checkout-sessions](https://docs.digitalriver.com/digital-river-api/integration-options/low-code-checkouts/handling-completed-checkout-sessions.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://docs.digitalriver.com/digital-river-api/integration-options/checkouts/creating-checkouts/using-the-checkout-identifier.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://docs.digitalriver.com/digital-river-api/sitemap.md

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

### Option 3 — Retrieve the full documentation corpus

Full export: https://docs.digitalriver.com/digital-river-api/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., `/digital-river-api/integration-options/checkouts/creating-checkouts/using-the-checkout-identifier.md`).

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