Invoices are pushed to Quickbooks Online via a one-way integration. An invoice will be pushed when one of the following occurs:
The invoice is marked as finished
HCP | QBO |
 | 
|
The invoice is sent to the customer
HCP | QBO |
 | 
|
The invoice is marked as paid
HCP | QBO |
 |  |
If multiple buttons are pushed throughout the job lifecycle (e.g. the job is marked finished and then is paid at a later date), the first trigger (finished in this example) will push the invoice over to QuickBooks and create a link between the HCP and QBO invoices. Then all following triggers, such as entering payment or sending the invoice, will update that same invoice via the link moving forward.
Note: You can also manually push an invoice over to Quickbooks. Review this article to learn more!