Blink
Navigate to the My Blink Pages page under the Customer Centre section. Choose which Blink Page you want to link to Quickbooks and copy the URL.
Add Blink to an invoice template.
Reporting
Quickbooks
When a customer pays you online, Quickbooks online marks the invoice as paid (you don't receive an alert or notification).
Blink
Within Blink, you can view the payments within the relevant payment methods under Reporting.