Yes, you can use card reader for QuickBooks Online (QBO) and GoPayment part of QuickBooks which allows you to process payments on the go, @copyboys. Allow me to share more details below.
To take payments using a card reader, you'll need to get the QuickBooks GoPayment app and card reader, which work either on their own or with QuickBooks Online.
Additionally, you can check out these articles for more details and guidance in managing card reader and GoPayment in QuickBooks:
Moreover, once you're ready to process and accept payment in using the GoPayment app, you can visit this article for future reference: Process payments in the GoPayment app.
Please let me know by posting a reply in thread if you have clarification in managing GoPayments and card readers in QuickBooks. I'm always around to assist you.
