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

# Dev Mode

> Sandbox testing with the MOCK operator

## Sandbox Environment

Use your `sk_test_` API key to access the sandbox. The same production endpoint is used — the key determines the environment.

### MOCK Operator

The `MOCK` operator simulates the full mobile money payment flow without real charges. Use it for:

* Development and testing
* CI/CD pipelines
* Demo environments

```json theme={null}
{
  "amount": 10000,
  "operator": "MOCK",
  "operatorPhone": "+2389001234"
}
```

### Simulating Payment Flows

In sandbox mode, payments are created in `CREATED` status. Use the confirm endpoint to simulate the customer approving the payment:

```bash theme={null}
# Create a payment
POST /v1/payments
→ status: "CREATED"

# Simulate customer confirmation
POST /v1/payments/{id}/confirm
→ status: "DEBITED"
```

<Info>The confirm endpoint is only available in sandbox mode. In production, payments are confirmed by the customer through their mobile money app.</Info>

### Testing Webhooks

Webhooks work the same way in sandbox and production. Set up a webhook endpoint and you'll receive events for sandbox payments too.

<Tip>Use a tool like [ngrok](https://ngrok.com) to expose your local development server for webhook testing.</Tip>

### Moving to Production

When you're ready to go live:

1. Create a `sk_live_` API key in the dashboard
2. Replace `MOCK` with the real operator (`CVMOVEL` or `UNITEL_TMAIS`)
3. Ensure your webhook endpoints are accessible from the internet
4. Test with a small real payment before going live