---
title: PKPaymentError.Code.unknownError
framework: passkit
role: symbol
role_heading: Case
path: passkit/pkpaymenterror/code/unknownerror
---

# PKPaymentError.Code.unknownError

The error code that indicates an unknown error.

## Declaration

```swift
case unknownError
```

## Discussion

Discussion User this error code if an unknown but non-fatal error occurred during payment processing.  The user can attempt to authorize the transaction again.

## See Also

### Error codes

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