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:
