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# instanceAID

The unique identifier for the applet instance.

```
let instanceAID: Data
```

## Discussion

Use this identifier in [`performWiredTransaction(using:over:instanceAID:)`](/documentation/SecureElementCredential/CredentialSession/performWiredTransaction(using:over:instanceAID:)) for UIKit or [`performTransactionInWiredMode(using:instanceAID:)`](/documentation/SecureElementCredential/CredentialTransaction/performTransactionInWiredMode(using:instanceAID:)) for SwiftUI, and when selecting this instance to perform data transceiving.

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