If you have an invoice in HouseCall that you accidentally marked as paid in QQuickBooks Online and need to import the payment - 

In the job details, scroll down to the bottom of the page and select the three little dots next to QuickBooks Online
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Select PULL PAYMENT FROM QuickBooks Online
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This new option, allows you to pull the payment directly from QuickBooks Online into HouseCall to match payments without creating a new one. 

Battling unpaid invoices? Check out 7 ways to get paid fast!