When you want to purchase an in-app in your NAVIGON app you get the error "In-app purchase not allowed". The reason for this error is a restriction in your settings.
- Open Settings > General > Restrictions on your iPhone/ iPad.
- Type in your Restrictions passcode.
- Activate in-app purchases.
Further information can be found on the following Link:https://support.apple.com/en-us/HT201304