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

## Environment Domains {#environment-domains}

* Production
* MTF
* Sandbox

```server
https://api.mastercard.com/global-processing/authentication
```

```server
https://mtf.api.mastercard.com/global-processing/authentication
```

```server
https://sandbox.api.mastercard.com/global-processing/authentication
```

## APIs {#apis}


API Specification: `https://static.developer.mastercard.com/content/mastercard-processing-authentication/swagger/oas_authentication_issuer_outbound.yaml`


API Specification: `https://static.developer.mastercard.com/content/mastercard-processing-authentication/swagger/oas_authentication_issuer_inbound.yaml`