If you are unable to find an invoice or customer on Chargezoom or QuickBooks, please verify the following

Resync from the Merchant portal

Integrations | Accounting Package > View Log

You can click the ReSync buttons to try and resync the invoice or customer 

If there is no Red Re-sync button and just states Not Synced, check the web connector.

Resync from the QB Web Connector

Open QB web connector on your desktop > check the box on the left-hand side of the Payportal application ? click Update Selected