Link your Square merchant account and QuickBooks Online to download sales transactions processed through Square.
Select Apps from the left menu.
Select Find apps at the top.
In the Search apps field, enter Square then select Sync with Square.
Select Get App Now.
Follow the prompts to complete the process. Make sure to allow Intuit to access your Square account.
The first time you connect your account, QuickBooks Online looks for the last day you processed transactions. It will give you a day’s worth of transactions so you can test drive the import.
If you haven’t processed anything in over 15 days, you will not see transactions until the day after you process a transaction using your Square account. For example, if you processed transactions yesterday, and also one day last week, you will only see your daily batches from yesterday. Every day's batch thereafter will be available for import. To learn more about QuickBooks and Square integration, visit https://quickbooks.intuit.com/integrations/square.