---
title: usageDescriptionKey
framework: passkit
role: symbol
role_heading: Instance Property
path: passkit/pkidentityrequest/usagedescriptionkey
---

# usageDescriptionKey

A key in the NSIdentityUsageDescriptionDictionary field of the app’s Info.plist file.

## Declaration

```swift
var usageDescriptionKey: String? { get set }
```

## Discussion

Discussion The value for this key is an app-provided string that describes the reason for requesting identity information.