Solved
Can QB integrate with epos ? If yes then how ?
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I can help you with integrating QuickBooks Online (QBO) with other apps, @grocery.frozenfo.
You can go to this link QuickBooks Aps and then search for the app Epos. That site contains all the third-party apps that integrates successfully with QBO. From here, you can check in their site on how to integrate it with QBO. 
You can also check this article for more information: Install and use apps.
If there's anything else I can do for you with integrating apps, please let me know by leaving a reply below. Take care and have a great rest of the day!