---
title: userID
framework: authenticationservices
role: symbol
role_heading: Instance Property
path: authenticationservices/asauthorizationpublickeycredentialassertion/userid
---

# userID

A user identifier for the assertion.

## Declaration

```swift
var userID: Data! { get }
```

## See Also

### Getting the properties

- [signature](authenticationservices/asauthorizationpublickeycredentialassertion/signature.md)
- [rawAuthenticatorData](authenticationservices/asauthorizationpublickeycredentialassertion/rawauthenticatordata.md)