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

# Kalixo Checkout

> Accept payments with one integration. Kalixo is merchant of record and handles the payment providers for you.

Kalixo Checkout lets you collect payments from your shoppers without integrating a
payment provider. You create a checkout session with the amount to charge, show the
checkout with **Kalixo.js** or the **hosted checkout**, and receive signed webhooks
when the payment succeeds.

Kalixo is the merchant of record. Kalixo chooses and operates the payment providers,
so provider changes never require work on your side.

> [card] [Quickstart](https://developer.kalixo.io/checkout/quickstart.md)
>
> Take a test payment in about ten minutes.

> [card] [Kalixo.js](https://developer.kalixo.io/checkout/guides/kalixo-js.md)
>
> Embed the checkout in your own page.

> [card] [Webhooks](https://developer.kalixo.io/checkout/concepts/webhooks.md)
>
> Get notified when payments, refunds and disputes change.

> [card] [API reference](https://developer.kalixo.io/checkout/api-reference/introduction.md)
>
> Every endpoint, field and error.

## How it works

```mermaid theme={"dark"}
sequenceDiagram
  participant Server as Your server
  participant Page as Your checkout page
  participant Kalixo as Kalixo Checkout
  Server->>Kalixo: Create a checkout session (amount, reference)
  Kalixo-->>Server: Session ID and client secret
  Page->>Kalixo: Kalixo.js shows the payment form
  Kalixo-->>Page: Payment result
  Kalixo->>Server: Signed webhook (payment.captured)
```

## Environments

| Environment | API | Keys |
| - | - | - |
| Sandbox | `https://sandbox.checkout.kalixo.io` | `kc_sk_test_...`, `kc_pk_test_...` |
| Live | `https://checkout.kalixo.io` | `kc_sk_live_...`, `kc_pk_live_...` |

The sandbox never moves money. Build against the sandbox, then switch keys.


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