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

# API Development

## Docs

- [API Quickstart](https://developers.afterpay.com/afterpay-online-developer/main/guides/api-development/api-quickstart.md)
- [Create a Checkout](https://developers.afterpay.com/afterpay-online-developer/main/guides/api-development/api-quickstart/create-a-checkout.md)
- [Immediate Capture](https://developers.afterpay.com/afterpay-online-developer/main/guides/api-development/api-quickstart/immediate-capture.md)
- [Deferred Capture](https://developers.afterpay.com/afterpay-online-developer/main/guides/api-development/api-quickstart/deferred-capture.md)
- [Create a Refund](https://developers.afterpay.com/afterpay-online-developer/main/guides/api-development/api-quickstart/create-a-refund.md)
- [Test Environments](https://developers.afterpay.com/afterpay-online-developer/main/guides/api-development/test-environments.md)
- [Certification](https://developers.afterpay.com/afterpay-online-developer/main/guides/api-development/certification.md)
- [Disputes](https://developers.afterpay.com/afterpay-online-developer/main/guides/api-development/disputes.md)
- [Integrate with the Disputes API](https://developers.afterpay.com/afterpay-online-developer/main/guides/api-development/disputes/integrate-with-the-disputes-api.md)
- [Manage Disputes in the Business Hub](https://developers.afterpay.com/afterpay-online-developer/main/guides/api-development/disputes/manage-disputes-in-the-business-hub.md)
- [Express Checkout](https://developers.afterpay.com/afterpay-online-developer/main/guides/api-development/additional-features/express-checkout.md)
- [Getting Started](https://developers.afterpay.com/afterpay-online-developer/main/guides/api-development/additional-features/express-checkout/getting-started.md)
- [Integrated Shipping](https://developers.afterpay.com/afterpay-online-developer/main/guides/api-development/additional-features/express-checkout/integrated-shipping.md)
- [Deferred Shipping](https://developers.afterpay.com/afterpay-online-developer/main/guides/api-development/additional-features/express-checkout/deferred-shipping.md)
- [Afterpay On File](https://developers.afterpay.com/afterpay-online-developer/main/guides/api-development/additional-features/express-checkout/afterpay-on-file.md)
- [Reference Information](https://developers.afterpay.com/afterpay-online-developer/main/guides/api-development/additional-features/express-checkout/reference-information.md)
- [Afterpay On File](https://developers.afterpay.com/afterpay-online-developer/main/guides/api-development/additional-features/afterpay-on-file.md)
- [Checkout Widget](https://developers.afterpay.com/afterpay-online-developer/main/guides/api-development/additional-features/checkout-widget.md)
- [Account Linking (Oauth)](https://developers.afterpay.com/afterpay-online-developer/main/guides/api-development/additional-features/account-linking-oauth.md)
- [Upgrade from API v1 to v2](https://developers.afterpay.com/afterpay-online-developer/main/guides/api-development/upgrade-from-api-v-1-to-v-2.md)