# init(delegate:queue:) Creates a new session instance for processing NFC payment tags. ``` @nonobjc convenience init(delegate: any NFCTagReaderSessionDelegate, queue: DispatchQueue? = nil) ``` ## Parameters `delegate` A delegate that receives callbacks about discovered tags and session life cycle events. The session holds a weak reference to the delegate. `queue` A dispatch queue on which to perform delegate callbacks. The session object retains the provided dispatch queue. If this value is `nil`, the framework creates an internal serial dispatch queue for the session. ## Discussion Creating a session requires that your app have the entitlement; if it’s missing, your delegate receives the callback [`tagReaderSession(_:didInvalidateWithError:)`](/documentation/CoreNFC/NFCTagReaderSessionDelegate-2joku/tagReaderSession(_:didInvalidateWithError:)) with the error [`NFCReaderError.Code.readerErrorSecurityViolation`](/documentation/CoreNFC/NFCReaderError-swift.struct/Code/readerErrorSecurityViolation). Additionally, the app’s information property list must contain a non-empty usage description string. If it’s absent, the delegate doesn’t receive tag-discovery callbacks. When the session discovers an ISO 7816-compatible tag, the session performs a `SELECT` command for each application identifier provided in . The `SELECT` command searches for the identifiers in the order in which they appear in the array. The session calls the [`tagReaderSession(_:didDetect:)`](/documentation/CoreNFC/NFCTagReaderSessionDelegate-2joku/tagReaderSession(_:didDetect:)) delegate method after the first successful `SELECT` command. The [`initialSelectedAID`](/documentation/CoreNFC/NFCISO7816Tag/initialSelectedAID) property of the found tag contains the selected identifier. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)