# Missing Commercial Countries
source: https://developer.mastercard.com/mastercard-developers-api/documentation/errors/missing-commercial-countries/index.md

This error occurs when the `commercialCountries` field is missing in the request.

### Solution {#solution}

Make sure to provide the list of countries where you engage in business. It is used to determine whether you are eligible to use a specific service or API in a geographic location.

### API Error Response {#api-error-response}

**HTTP code 400**

```JSON
{
  "Errors": {
    "Error": [
      {
        "Description": "Commercial countries are required",
        "Details": "",
        "ReasonCode": "MISSING_COMMERCIAL_COUNTRIES",
        "Recoverable": false,
        "Source": "DEVELOPERS_API"
      }
    ]
  }
}
```

[Back to Errors List](https://developer.mastercard.com/mastercard-developers-api/documentation/code-and-formats/index.md#list-of-common-api-errors)​​