How to fix this error message when syncing with QuickBooks... CustomerRef is missing in the request
I'm here to ensure you'll get the right support to surpass the error message, laura107.
I'd recommend checking out with the third-party provider. They have the resources to take a look into this and can check about the data they import. QuickBooks depends on the information sent by the app.
Please get back to this thread if you have other questions syncing third-party apps to QuickBooks Online. I'm always here to help.