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

# COPE developer docs

> Public COPE developer documentation for checkout SDK integrations, public API usage, and webhook events.

# COPE developer docs

Use these docs to build COPE checkout integrations, consume public APIs, and subscribe to webhook events. Generated event pages are backed by COPE public event contracts and payload schemas.

## Start here

* [Build a vendor integration](./quickstart/build-an-integration) — end-to-end walkthrough plus a deployable reference sample.
* [Consume webhooks](./quickstart/consume-webhooks).
* [Read the public API overview](./api-reference/overview).
* [Read the webhook overview](./webhooks/overview).
* [Verify webhook signatures](./webhooks/signing).
* [Understand cart, checkout, and order states](./reference/cart-checkout-order-lifecycle).
* [Understand payment states](./reference/payment-lifecycle).
* [Browse public webhook events](./webhooks/events).
* [Review the CloudEvents envelope](./reference/event-envelope).