Hello bernd-born-iclou,
Welcome to the QuickBooks Community! Currently, the connection between QuickBooks Online and Apple cards is unavailable. However, some of our Community members mentioned utilizing MT Online or the csv2qbo converter as a workaround until it is available.
That being said, you can also visit this link to see available apps: QuickBooks App Store. Choose an app that best suits your business under the CATEGORIES section.
Don't hesitate to post again if there's anything else you need by commenting below. I'll be right here to help you.