---
title: preferredAIDList
framework: proximityreader
role: symbol
role_heading: Instance Property
path: proximityreader/paymentcardtransactionrequest/preferredaidlist
---

# preferredAIDList

The preferred Application Identifier (AID) or Registered Application Provider Identifier (RID).

## Declaration

```swift
var preferredAIDList: [Data]
```

## Discussion

Discussion An ordered list of valid binary data between 5 and 16 bytes representing the preferred AID or RID. Use the preferred AID or RID when completing transactions with co-badged cards - a co-badged or co-branded card is a payment card that supports two or more payment brands. note: In iOS 16 and earlier, the framework only uses the first entry. In iOS 17 and later, the list can have up to four entries.