Hi there, maryap! 

I hope you're doing well. I'm here to help you with your query regarding connecting banks in QuickBooks Online (QBO). 

QBO currently offers integration with various financial institutions. To check if John Lewis's credit card Newday is compatible with QBO, I suggest getting in touch with your bank's Customer Care Team. They can provide you with the necessary information on the connection process. 

Once you have confirmed the compatibility, you can refer to this guide on how to connect your credit card account to QBO: Connect and manage your bank account in QuickBooks Online. 

After you are done setting it up, you can use this article as a reference to manage your bank transactions: Find and categorise transactions in QuickBooks. 

If you have any further questions or concerns about connecting your bank account, don't hesitate to let me know in the comments section below. I'm always here to help you out. Have a great day!