Can Quickbooks Online sync with Square Invoices, since it's apparently a different system than Square Online (which we currently have synced and it's working)?

Hello, pirateislandcoff. 

As of this moment, the option to integrate Square Online or manually sync invoices into Square Online in QuickBooks Online is not possible.  

We understand that each business has unique needs, and each version of QuickBooks has unique features.  

Our product engineers are working diligently for updates and improvements on the features. For now, I recommend sending your feedback straight to our dedicated team to help make changes to QuickBooks capability. Your suggestions and ideas will help us stay in tune with what our customers need, want, and expect. Here's how:  

1. Sign in to your QuickBooks account.
2. Click the Gear icon in the upper-right corner.
3. Select Feedback under Profile.
4. Share your feedback.
5. Hit Next. 

Your feedback's definitely valuable to Intuit. It will be reviewed by our Product Development team and considered in future updates. You can stay up-to-date with the latest news about your product by reviewing Intuit's Product Updates webpage. 

To learn more about sync with Square, you can refer to these articles:

• Sync with Square - Default Accounts and Names
• Connect your QuickBooks Online to Square

Don’t hesitate to drop a comment if you have other concerns in QBO. I’m always here to help. Take care and have a good one!

@pirateislandcoff 

You need a 3rd party connector app.

Thank you. Would you happen to know what app would work?

OK thanks. 

I did try to upload my invoices from an export from Square Invoices, and succeeded in doing so, but the DATE PAID information did not import so it looks like my entire year's invoices were paid yesterday.  Is there a way to fix all these or would I need to go back and manually change the DATE PAID information on each of these invoices?  Thank you for your help.

Explore this one

https://synder.grsm.io/quickbooks