I can share some information about syncing third-party apps in QuickBooks Online, @hi just me.
I suggest checking out the Shopmonkey app Customer Support on how to integrate the app with QuickBooks Online (QBO). You may also verify with them how your deposits will sync to your QuickBooks. To check for any third-party apps app that works with QBO, go to this link: Find the right apps for your business.
In the meantime, here's how to put transactions into your Undeposited Funds account and use the bank deposit feature to combine them: Record and make bank deposits in QuickBooks Online.
Let me know in the Reply section if you need more help syncing your apps in QBO. I'm always here to assist. Have a great rest of the day!