---
title: unknownError
framework: passkit
role: symbol
role_heading: Type Property
path: passkit/pkpaymenterror/unknownerror
---

# unknownError

The error code for an unknown error.

## Declaration

```swift
static var unknownError: PKPaymentError.Code { get }
```

## Discussion

Discussion Use this error code if an unknown but non-fatal error occurred during payment processing.  The user can attempt authorization again.

## See Also

### Identifying the error

- [billingContactInvalidError](passkit/pkpaymenterror/billingcontactinvaliderror.md)
- [shippingContactInvalidError](passkit/pkpaymenterror/shippingcontactinvaliderror.md)
- [shippingAddressUnserviceableError](passkit/pkpaymenterror/shippingaddressunserviceableerror.md)
- [couponCodeExpiredError](passkit/pkpaymenterror/couponcodeexpirederror.md)
- [couponCodeInvalidError](passkit/pkpaymenterror/couponcodeinvaliderror.md)
- [PKPaymentError.Code](passkit/pkpaymenterror/code.md)