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

# API Development

## Docs

- [API Quickstart](https://developers.cash.app/afterpay/guides/api-development/api-quickstart.md)
- [Create a Checkout](https://developers.cash.app/afterpay/guides/api-development/api-quickstart/create-a-checkout.md)
- [Immediate Capture](https://developers.cash.app/afterpay/guides/api-development/api-quickstart/immediate-capture.md)
- [Deferred Capture](https://developers.cash.app/afterpay/guides/api-development/api-quickstart/deferred-capture.md)
- [Create a Refund](https://developers.cash.app/afterpay/guides/api-development/api-quickstart/create-a-refund.md)
- [Test Environments](https://developers.cash.app/afterpay/guides/api-development/test-environments.md)
- [Certification](https://developers.cash.app/afterpay/guides/api-development/certification.md)
- [Disputes](https://developers.cash.app/afterpay/guides/api-development/disputes.md)
- [Integrate with the Disputes API](https://developers.cash.app/afterpay/guides/api-development/disputes/integrate-with-the-disputes-api.md)
- [Manage Disputes in the Business Hub](https://developers.cash.app/afterpay/guides/api-development/disputes/manage-disputes-in-the-business-hub.md)
- [Webhook Signature Generation](https://developers.cash.app/afterpay/guides/api-development/webhook-signature-generation.md)
- [Express Checkout](https://developers.cash.app/afterpay/guides/api-development/additional-features/express-checkout.md)
- [Integrated Shipping](https://developers.cash.app/afterpay/guides/api-development/additional-features/express-checkout/integrated-shipping.md)
- [Deferred Shipping](https://developers.cash.app/afterpay/guides/api-development/additional-features/express-checkout/deferred-shipping.md)
- [Reference Information](https://developers.cash.app/afterpay/guides/api-development/additional-features/express-checkout/reference-information.md)
- [Afterpay On File](https://developers.cash.app/afterpay/guides/api-development/additional-features/afterpay-on-file.md)
- [Checkout Widget](https://developers.cash.app/afterpay/guides/api-development/additional-features/checkout-widget.md)
- [Overview](https://developers.cash.app/afterpay/guides/api-development/add-cash-app-pay-to-your-site/overview.md)
- [Cash App Pay On File](https://developers.cash.app/afterpay/guides/api-development/add-cash-app-pay-to-your-site/cash-app-pay-on-file.md)

## API Docs

- Add Cash App Pay to Your Site [Retrieve Cash App Pay Grant](https://developers.cash.app/afterpay/guides/api-development/add-cash-app-pay-to-your-site/retrieve-grant.md)
- Add Cash App Pay to Your Site [Revoke Cash App Pay Grant](https://developers.cash.app/afterpay/guides/api-development/add-cash-app-pay-to-your-site/revoke-grant.md)
- Add Cash App Pay to Your Site [Event: grant.status.updated](https://developers.cash.app/afterpay/guides/api-development/add-cash-app-pay-to-your-site/grant-status-updated.md)

## OpenAPI Specification

The raw OpenAPI 3.1 specification for this API is available at:
- [OpenAPI JSON](https://developers.cash.app/openapi.json)
- [OpenAPI YAML](https://developers.cash.app/openapi.yaml)