Hi there @Chowbotics,

Yes, there's a sand box for QBO. You can find it in the Intuit Developer Community. Hover your mouse over API Docs & Tools at the top right corner, highlight QuickBooks Online,  and then choose Sandbox .

Here's also a direct link: https://developer.intuit.com/v2/ui#/sandbox

You'll be asked to sign in with your Intuit credentials. If you already have a QBO account, you can use the same login info. Otherwise, you'll need to create an Intuit account.

:smileywink: