Click Apps on the left menu and go to the FindApps tab.
Search for ContractorTools and click on the search result.
Click Learn More to see the integration process.
If you need further information to sync your data, I'drecommend contacting the ContractorTools' support team. They can assist you more with the integration process.
Aside from that, you can also visit our Intuit Developer page. There are QuickBooks users, engineers, and developers that can also share their idea about the third-party application you're using.