> For the complete documentation index, see [llms.txt](https://docs.tiun.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tiun.io/readme.md).

# What is tiun

## The commercial backend for SaaS, AI and digital products.

One system for authentication, payments, and customer data.\
No backend to build. No payment UI to design. Integrate once and go live.

[Get started](/quickstart.md) | [How it works](/how-it-works.md)

***

## Why tiun

* **No backend required** — tiun is the backend. Authentication, billing, and access control are handled for you.
* **No UI to design** — Checkout, login, and paywall overlays are built in and fully managed.
* **One SDK, all product types** — Subscriptions and time-based billing through the same integration.
* **Go live in a day** — Install the SDK, create a product in the dashboard, and you're ready to charge.

***

## Community

Join the conversation, ask questions, and share what you're building.

<table data-card-size="large" data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><strong>Discord</strong></td><td>Ask questions, get help, and connect with other developers building on tiun.</td><td><a href="https://discord.gg/NCggN2ExZ9">https://discord.gg/NCggN2ExZ9</a></td></tr></tbody></table>


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.tiun.io/readme.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.