# API Reference
source: https://developer.mastercard.com/pay-with-rewards/documentation/api-reference/index.md

## Environment Domains {#environment-domains}

* Sandbox
* Production

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

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

## Test Accounts {#test-accounts}

Additional test accounts for the API Explorer is available [here](https://developer.mastercard.com/pay-with-rewards/documentation/integration-and-testing/index.md#additional-test-data)

## APIs {#apis}


API Specification: `https://static.developer.mastercard.com/content/pay-with-rewards/swagger/mastercard-pay-with-rewards.yaml`

## Next Steps {#next-steps}

Now that you have a good understanding of all the services endpoints, proceed to the [Integration and Testing](https://developer.mastercard.com/pay-with-rewards/documentation/integration-and-testing/index.md) section to learn how to integrate and make sure you are ready to begin testing.