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

## Environment Domains {#environment-domains}

* Sandbox
* Production

```Sandbox
https://sandbox.api.mastercard.com/loyalty/mrs
```

```Production
https://api.mastercard.com/loyalty/mrs
```

## APIs {#apis}


API Specification: `https://static.developer.mastercard.com/content/transactions-service/swagger/mrs-transactions-service-swagger.yaml`