> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://developers.clearpay.co.uk/v-2/guides/api-development/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://developers.clearpay.co.uk/_mcp/server.

# API Development

## Docs

- [API Quickstart](https://developers.clearpay.co.uk/v-2/guides/api-development/api-quickstart.md): Get started with the Clearpay API - essential endpoints and basic integration flow
- [Create a Checkout](https://developers.clearpay.co.uk/v-2/guides/api-development/api-quickstart/create-a-checkout.md): Learn how to create a Clearpay checkout and launch the customer payment flow
- [Immediate Capture](https://developers.clearpay.co.uk/v-2/guides/api-development/api-quickstart/immediate-capture.md): Capture the full payment amount immediately after checkout completion
- [Deferred Capture](https://developers.clearpay.co.uk/v-2/guides/api-development/api-quickstart/deferred-capture.md): Authorize payments upfront and capture funds when you're ready to fulfill orders
- [Refunds](https://developers.clearpay.co.uk/v-2/guides/api-development/api-quickstart/create-a-refund.md): Process full and partial refunds for Clearpay payments
- [Test Environments](https://developers.clearpay.co.uk/v-2/guides/api-development/test-environments.md): Test your Clearpay integration safely using the sandbox environment
- [Certification Testing](https://developers.clearpay.co.uk/v-2/testing-your-clearpay-integration.md): 
- [Display the checkout widget](https://developers.clearpay.co.uk/v-2/the-clearpay-widget.md): 
- [Introduction to Express Checkout](https://developers.clearpay.co.uk/v-2/expresscheckout-1.md): Learn about Clearpay Express Checkout and how it reduces checkout steps for higher conversion
- [Set up express checkout with integrated shipping](https://developers.clearpay.co.uk/v-2/ec-int-shipping.md): Learn how to implement Clearpay Express Checkout with integrated shipping options
- [Set up express checkout with deferred shipping](https://developers.clearpay.co.uk/v-2/ec-deferred-shipping.md): Learn how to implement Clearpay Express Checkout with deferred shipping options
- [Express checkout reference](https://developers.clearpay.co.uk/v-2/ec-reference-info.md): Technical reference information for Clearpay Express Checkout implementation