I can help you integrate data into QuickBooks Online (QBO), Alison.

It's worth noting that while the LightSpeed app is compatible with QBO for syncing sales data, occasional compatibility issues or specific setup needs may arise and should be addressed. Also, QuickBooks is dependent on the data transmitted by the third-party app.

To resolve this, I recommend contacting LightSpeed support again for insights into their data transmission methods and any additional steps needed to synchronize all information with QBO. Their expertise will be invaluable in resolving the syncing issue.

I'm also adding this link where you can find supported third-party applications if you want an alternative: Apps help QuickBooks run better. You can type in some keywords and take the time to look for reviews for better recommendations.

Additionally, you can visit this article to further guide you in managing sales transactions and growing your business with QBO: Sales and customers.

Please don't hesitate to ask if you have further questions or need additional assistance integrating sales transactions in QuickBooks. I'm here to support you throughout this process. Take care.