# Fraud Detection testing

When you [request a payment](https://api-reference.checkout.com/tag/Payments/#operation/requestAPaymentOrPayout) with the [Fraud Detection](https://www.checkout.com/docs/business-operations/prevent-fraud.md) solution enabled, you can receive fraud-risk specific [API response codes](https://www.checkout.com/docs/developer-resources/codes/api-response-codes.md#4xxxx_Risk_responses).

You can test these response codes in the sandbox environment by providing the following values in your payment requests:

| Response code | Value |
| --- | --- |
| `43102` | Set the `metadata.test` field to `43102`. |
| `43201` | Set the card number `source.number` field to `4929011117589785`.<br><br>Alternatively, set the card expiry date as follows:<br>- `source.expiry_month` field to `12`<br>- `source.expiry_year` field to `30` |
| `43202` | Set the card number `source.number` field to `4929021117589784`. |
| `43203` | Set the `customer.email` field to `decline@highrisk.com`. |
| `43204` | Set the `customer.phone.number` field to `07700900999`. |
| `43205` | Set the `payment_ip` field to `172.225.243.63`. |
| `43206` | Set the `customer.email` field to `{Any-text}@decline.cko`. |