---
title: protocolVersion()
framework: authenticationservices
role: symbol
role_heading: Instance Method
path: authenticationservices/asauthorizationproviderextensionregistrationhandler/protocolversion()
---

# protocolVersion()

## Declaration

```swift
optional func protocolVersion() -> ASAuthorizationProviderExtensionPlatformSSOProtocolVersion
```

## Mentioned in

Creating extensions that support Platform SSO

## See Also

### Instance Methods

- [registrationDidCancel()](authenticationservices/asauthorizationproviderextensionregistrationhandler/registrationdidcancel().md)
- [supportedGrantTypes()](authenticationservices/asauthorizationproviderextensionregistrationhandler/supportedgranttypes().md)