This incident has been resolved. We fixed the disruptions affecting the Vipps, Swish, and MobilePay Online payment apps within QuickPay's Shopify processing.
If you are affected, please uninstall and reinstall the affected app(s) using your Shopify Admin user to resolve the issue. Please note that simply disabling and re-enabling the app will not fix the problem. A full uninstall and reinstall is required.
Once you are logged into QuickPay Manager, go to Settings, click External Integrations, and select Shopify.
For the affected store(s), please follow these steps:
Click "Delete app"
Click "Show not installed apps"
Install the required app
Any affected failed transactions must be cancelled to avoid duplicate transactions.