# API Reference
source: https://developer.mastercard.com/merchant-identifier/documentation/api-reference/index.md

## Environment Domains {#environment-domains}

* Sandbox
* Production

```Sandbox
https://sandbox.api.mastercard.com/merchant-identifier
```

```Production
https://api.mastercard.com/merchant-identifier
```

Note: For a list of sandbox data, please click [here](https://static.developer.mastercard.com/content/merchant-identifier/uploads/merchant-identifier-sandbox-merchant-descriptors.xlsx)

## APIs {#apis}


API Specification: `https://static.developer.mastercard.com/content/merchant-identifier/swagger/merchantidentifier-v3.yaml`

## Next Steps {#next-steps}

1. Check [Merchant API Endpoint Overview](https://developer.mastercard.com/merchant-identifier/documentation/tutorials-and-guides/endpoint-overview/index.md) to know more about the individual API endpoints
2. See how clients apply this data in [Use Cases](https://developer.mastercard.com/merchant-identifier/documentation/use-cases/index.md)
3. Know more about the merchant location data attributes [Data Elements documentation](https://developer.mastercard.com/merchant-identifier/documentation/tutorials-and-guides/data-elements/index.md)
4. See [Codes and Formats](https://developer.mastercard.com/merchant-identifier/documentation/code-and-formats/index.md) for detailed information about error response handling for Merchant Identifier APIs