# llms.txt

## Table of contents

 - [Shift4 dev docs (Redocly Realm)](https://matterhorn-api.redocly.app/claude.md)
 - [Payments optimization](https://matterhorn-api.redocly.app/docs/payments-optimization.md)
 - [CSP integration](https://matterhorn-api.redocly.app/docs/csp-integration.md)
 - [Getting Started](https://matterhorn-api.redocly.app/docs/api.md)
 - [Apple Pay Registration](https://matterhorn-api.redocly.app/docs/apple-pay-registration.md)
 - [Platform](https://matterhorn-api.redocly.app/docs/platforms.md)
 - [Using Components](https://matterhorn-api.redocly.app/docs/using-components.md)
 - [Checkout customization](https://matterhorn-api.redocly.app/docs/checkout/customization.md)
 - [Lists](https://matterhorn-api.redocly.app/docs/fraud-prevention/lists.md)
 - [Charging Cards](https://matterhorn-api.redocly.app/docs/charging-cards.md)
 - [Components](https://matterhorn-api.redocly.app/docs/components.md)
 - [Managing disputes](https://matterhorn-api.redocly.app/docs/disputes.md)
 - [Getting Started](https://matterhorn-api.redocly.app/docs.md)
 - [Payment Links](https://matterhorn-api.redocly.app/docs/payment-links.md)
 - [Testing](https://matterhorn-api.redocly.app/docs/testing.md)
 - [Webhooks](https://matterhorn-api.redocly.app/docs/webhooks.md)
 - [Checkout Request](https://matterhorn-api.redocly.app/docs/checkout/checkout-request.md)
 - [Checkout](https://matterhorn-api.redocly.app/docs/checkout.md)
 - [Using Checkout](https://matterhorn-api.redocly.app/docs/checkout/using-checkout-session.md)
 - [Rules](https://matterhorn-api.redocly.app/docs/fraud-prevention/rules.md)
 - [Verification Checks](https://matterhorn-api.redocly.app/docs/fraud-prevention/verification-checks.md)
 - [Components](https://matterhorn-api.redocly.app/docs/js/components.md)
 - [Getting started](https://matterhorn-api.redocly.app/docs/js.md)
 - [Shift4 object](https://matterhorn-api.redocly.app/docs/js/shift4-object.md)
 - [Styling](https://matterhorn-api.redocly.app/docs/js/styling.md)
 - [Salesforce Commerce Cloud](https://matterhorn-api.redocly.app/docs/plugins/salesforce-commerce-cloud.md)
 - [WooCommerce](https://matterhorn-api.redocly.app/docs/plugins/woo-commerce.md)
 - [Shift4 Gateway API](https://matterhorn-api.redocly.app/docs/api/shift4-gateway.md): The Shift4 API is organized around REST. Our API has predictable resource-oriented URLs, accepts form-encoded request bodies, returns JSON-encoded responses, and uses standard HTTP response codes, authentication, and verbs. ## Base URL All API requests should be made to: ``` https://api.shift4.com ``` ## Authentication The Shift4 API uses HTTP Basic Authentication. Provide your API secret key as the username and leave the password empty. ```bash curl https://api.shift4.com/charges -u pr_test_tXHm9qV9qV9bjIRHcQr9PLPa: ```