---
title: readerIdentifier
framework: proximityreader
role: symbol
role_heading: Instance Property
path: proximityreader/paymentcardreader/readeridentifier
---

# readerIdentifier

The unique identifier for this card reader.

## Declaration

```swift
var readerIdentifier: String { get async throws }
```

## Discussion

Discussion Include this identifier in support requests or tracing incidents to help track down potential problems. If the identifier isn’t readable, getting this value throws a PaymentCardReaderError.

## See Also

### Getting the configuration details

- [options](proximityreader/paymentcardreader/options-swift.property.md)