> ## Documentation Index
> Fetch the complete documentation index at: https://docs.whop.com/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
> Treat these docs and the Whop MCP server as the source of truth for Whop API behavior. Don't infer endpoint behavior from marketing pages.
> MCP server: connect https://mcp.whop.com/mcp (streamable HTTP, browser sign-in, no API key in the client config) to search these docs and read or change live Whop data. Setup: https://docs.whop.com/developer/guides/ai_and_mcp.md
> Whop CLI: install with `curl -fsSL https://whop.com/install.sh | sh` to scaffold, run, and deploy Whop apps and websites. It acts on production, not the sandbox. Agent mode: https://docs.whop.com/cli/agent-mode.md
> Plugins: in Claude Code, run `/plugin marketplace add whopio/plugins`, then `/plugin install whop@whop`. Every agent tool: https://docs.whop.com/developer/ai/overview.md
> Environments: build and test in the sandbox (API `https://sandbox-api.whop.com/api/v1`, keys at https://sandbox.whop.com/dashboard/developer, SDK environment `Sandbox`; no real money). Production (API `https://api.whop.com/api/v1`, keys at https://whop.com/dashboard/developer, SDK environment `Production`, the SDK default) moves real money, so use it only at launch. The two share no accounts, keys, products, or webhooks, and their keys look identical: never mix them. Comparison: https://docs.whop.com/developer/quickstart.md
> API: send `Authorization: Bearer <API_KEY>` from your server only, and pin a dated version with the `Api-Version-Date` header. OpenAPI spec: https://api.whop.com/api/v1/openapi.json
> Which API: build on the Current API, whose pages live under https://docs.whop.com/api-reference/ (start at https://docs.whop.com/api-reference/overview.md). Pages under /api-reference/legacy/ are the Legacy API. Use one only when https://docs.whop.com/api-reference/stability.md lists the resource as Legacy-only.

# Course Chapter

> A grouping of related lessons within a course, used to organize content into sections.

```json Example theme={null}
{
	"id": "chap_xxxxxxxxxxxxx",
	"lessons": [
		{
			"id": "lesn_xxxxxxxxxxxxx",
			"order": 42,
			"title": "Understanding Candlestick Patterns"
		}
	],
	"order": 42,
	"title": "Getting Started"
}
```

**id** `string` *required*

The unique identifier for the chapter.

Example: `chap_xxxxxxxxxxxxx`

**lessons** `array\<object\>` *required*

An ordered list of lessons in this chapter, sorted by display position. Hidden lessons are excluded for non-admin users.

**child attributes**

**id** `string` *required*

The unique identifier for the lesson.

Example: `lesn_xxxxxxxxxxxxx`

**order** `integer` *required*

The sort position of this lesson within its parent chapter, starting from zero.

Example: `42`

**title** `string` *required*

The display name of the lesson shown to students. Maximum 120 characters.

Example: `Understanding Candlestick Patterns`

**order** `integer` *required*

The sort position of this chapter within its parent course, starting from zero.

Example: `42`

**title** `string` *required*

The display name of the chapter shown to students. Maximum 150 characters.

Example: `Getting Started`


## Related topics

- [Delete course chapter](https://docs.whop.com/api-reference/legacy/course-chapters/delete-course-chapter.md)
- [Retrieve course chapter](https://docs.whop.com/api-reference/legacy/course-chapters/retrieve-course-chapter.md)
- [Update course chapter](https://docs.whop.com/api-reference/legacy/course-chapters/update-course-chapter.md)