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

> ## Agent Instructions
> When building application code, use `@naturalpay/sdk` for TypeScript or `naturalpay` for Python.
> When operating Natural directly for a user, use the payments MCP at `https://mcp.natural.com`.
> When searching Natural documentation, use the docs MCP at `https://docs.natural.com/mcp`.
> Use the Natural CLI for terminal and CI automation.
> Use REST only for unsupported languages or when the user explicitly requests raw HTTP.
> Start integration development and testing in the sandbox. Do not use production unless the user explicitly requests it.
> For sandbox requests that require `customerPartyId`, list customers first. Reuse only the intended fixture; otherwise create a customer.
> REST and SDK amounts use integer minor units. Payments MCP amounts use decimal strings with a required currency code.

# Sandbox

> Experience Natural without moving real money

<img src="https://mintcdn.com/natural-b3c9dd77/pPnF-06H78Do1npA/assets/heroes/sandbox-hero.jpg?fit=max&auto=format&n=pPnF-06H78Do1npA&q=85&s=981aae4ea7465d69aff3a62e86889e1a" alt="The Natural dashboard in sandbox mode" className="hero-image" noZoom width="2400" height="1280" data-path="assets/heroes/sandbox-hero.jpg" />

The sandbox is a complete Natural environment that functions like production.

Point your integration at the sandbox base URL with a sandbox key:

```text theme={null}
https://api.sandbox.natural.com
```

Keys carry their environment in the prefix (`sk_ntl_sandbox_...`, `ak_ntl_sandbox_...`) and never work anywhere else.

Sandbox keys come from the [dashboard](/guides/platform/dashboard): open the account menu in the bottom-left corner (the same menu you sign out from) and flip the **Sandbox** toggle.

## How it behaves

* **No separate onboarding.** Verified on Natural means verified in the sandbox: your organization carries over automatically, and the test parties you create are auto-verified.
* **Money moves instantly.** Transfers and payments settle as soon as you make them.
* You can reach your own parties and your [fixtures](/api-reference/sandbox/fixtures), nothing else. No other sandbox organization can see or touch your data.

## What you can do

| Surface          | What you can do                                                                                                                                                                                                                                                                                                                                                              |
| ---------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Connect          | [Invite a test customer](/api-reference/simulations/create-test-customer), [accept](/api-reference/simulations/accept-customer-invitation) or [decline](/api-reference/simulations/decline-customer-invitation) the pending invitation, then [fund it](/api-reference/simulations/fund-test-customer) or [revoke access](/api-reference/simulations/revoke-agent-connection) |
| Payments         | [Complete a payment claim](/api-reference/simulations/complete-payment-claim) held for an unregistered recipient                                                                                                                                                                                                                                                             |
| Payment requests | [Fulfill](/api-reference/simulations/fulfill-payment-request) or [decline](/api-reference/simulations/decline-payment-request) a request as the payer                                                                                                                                                                                                                        |
| Bank accounts    | [Link a test bank account](/api-reference/simulations/link-test-bank-account) to your own party                                                                                                                                                                                                                                                                              |

Sandbox endpoints sit next to the resources they test, marked with a `Sandbox:` prefix. Every action above is also available from MCP, the SDKs, and the CLI; see [Sandbox from MCP, CLI, and SDKs](/api-reference/sandbox/surfaces).