SkerrorDomain error 0 is one of the more common errors that you may struggle with while processing in-app purchases. This error can occur in both production and sandbox environments and affects the fail to success payment ratio of your app. 

Though the reason for this error is more likely to be on the App Store’s side, there still are a few things to try.  Here is a brief overview of the possible reasons for this error, and what you could do to prevent it from happening.