A list of common issues during payment processing and how to solve them.
Should you experience issues purchasing MindNode, as a first step please try to restart your device.
If the issue persists:
We are still not sure what is causing this error message, but many customers reported that they were able to resolve this issue by contacting Apple support. Some accounts have an In-App-Purchase or subscription restriction and Apple Support can lift this restriction. You can contact them using this URL: www.apple.com/support/itunes/ww/.
The most common reason for this issue is a bug related to Touch ID and In-App-Purchases/Subscriptions on macOS. To work around this: Open System Settings and navigate to the Touch ID preferences. Disable "iTunes & App Store" and reboot the Mac. Now you should be able to make the purchase. Afterward, you can reenable the preference.
If you have the macOS Firewall enabled, please ensure you have "Automatically allow downloaded signed software to receive incoming connections" enabled. You can find this control in System Settings under Security & Privacy > Firewall Options…. Learn more in Apple's firewall support document.
If the issue persists after the above steps, resetting the cache of accepted certificates can help:
Learn more in Apple's support document.
This message appears when you are currently in a different country than the country of your App Store account (e.g. when traveling or working abroad).
You can fix this issue by resetting the Mac App Store preferences: