1. Login to Online Check Writer and select Apps.
2. Click Sage Intacct and click Connect.
3. Click Continue.
4. Enter your Sage Intacct Company ID.
5. Click Submit.
6. Enter your Sage Intacct credentials to connect.
7. Click on Submit.

To import invoices from Sage Intacct, 

1. Go to Invoice in the Receivables bar.
2. Click Import Invoices and select Sage Intacct.
3. Choose the company and update Import Settings: select Time Span and Download Filter.
4. Click Start Importing.