PSD2 problems

Hi,

After the new purchasing regulation (PSD2), we are finding users who have been charged for the package they are in the process of purchasing, but never get the status of purchased in func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]).

We know this because we have our own log system with our backend, and we only see the status purchasing and failed with error unknown.

What is going on with the this, how is this possible?

Regards,

Luis Martínez