> For the complete documentation index, see [llms.txt](https://docs.faspay.co.id/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.faspay.co.id/merchant-integration/api-reference-1/faspay-billing-api.md).

# Faspay Billing API

Faspay Billing API is a system used to create an API-based online bill. Apart from being in the form of a dashboard, Faspay Billing will also support in the form of an API to facilitate if there are merchants who have qualified developer resources.

**Transaction Flow Faspay Billing API**

![Faspay Billing API Flow](/files/-MOUWWDXkbX_er29_z7w)

<table><thead><tr><th width="72">No</th><th>Process</th></tr></thead><tbody><tr><td>1</td><td>Merchant sends a CreateBilling API request to the Faspay server which functions to make online bills.</td></tr><tr><td>2</td><td>Faspay will provide a response link payment containing the bill.</td></tr><tr><td>3</td><td>Merchant will provide a billing link that must be paid by the customer.</td></tr><tr><td>4</td><td>Customer will make a payment which will be redirected to the Faspay Xpress page</td></tr><tr><td>5</td><td>After the payment is successful, Faspay will send a callback to the url that has been prepared by the merchant.</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.faspay.co.id/merchant-integration/api-reference-1/faspay-billing-api.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.