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Thanks for reaching out to us, huffmanbrandon.
I'd be glad to provide insights about the compatibility of using Square Card Reader with QuickBooks Online (QBO).
For now, we offer QuickBooks All-in-One Card and QuickBooks Chip and Magstripe Card Reader for QBO payments. You can check out this article that contains information about the features and compatibility of these card reader.
In the meantime, you'll want to connect it to your mobile or Square device. From there, download the transactions to QBO.
I also included these articles you can check for your future reference:
I'm looking forward to answering more questions from you soon. Thanks!