Thanks for posting in the Community, @m-ikramuddin-kar. I'll point you in the right direction to help resolve your concern. 

The Apps tab from the left menu in the program isn't fully functional yet. Rest assured that we're working for the app's integration for our international versions. 

I'd suggest contacting the Magento's dedicated support team to confirm if they can sync the data to QuickBooks Online (QBO). Once verified, they can help you complete the integration process from there. 

Since Magento is an e-commerce platform, I recommend visiting this resource hub: Customers And Income. It helps you efficiently manage your online sales after you've integrated its data to QBO. 

Don't hesitate to leave a comment below if you need anything else. The Community and I will help you.