Hi there, Hasanija.

The Connect to Square app is a one-way integration that imports your sales transactions from Square into QuickBooks Online daily. Once activated, the app monitors your Square account for all transactions including sales, refunds, taxes, tips, and discounts.

As what @Fiat Lux - ASIA mentioned, a third-party paid connected app is needed for the integration. 

If there's anything that you want us to help with, please get back to us so we can further assist you.