# requiredBillingContactFields A list of fields that you need for a billing contact to process the transaction. ``` var requiredBillingContactFields: Set { get set } ``` ## Discussion See [`PKContactField`](/documentation/PassKit/PKContactField) for the list of possible contact fields. --- 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)