I appreciate you reaching out in the Community, Mia. Let me direct you to the appropriate team that can help you integrate software into QuickBooks Online (QBO).
Integrating SumUp with QBO can be a great way to streamline your financial processes. To do this, login to your SumUp account and go to Settings. From there you can look for the radio button to Enable QuickBooks.
If you're unable to find the option, I'd recommend contacting SumUp support since they're familiar with their software and can walk you through the process.
Additionally, refer to this article on importing your data from other software as a CSV file in QBO: Import files in QBO.
Comment back to this post if you still have concerns about integrating other software in QBO. I'm here to help.
