Yes, at Pipemonk we do communicate in case something has failed to sync from your Shopify to QuickBooks Online.
After every sync, we show you the report which tells you how many changes are made in your QuickBooks Online along with the reasons for failure if any.
1. Following is a screenshot from one of the Pipemonk syncs that highlights this information.
2. If you wish to learn in-depth about the reason of sync failure, click More Detail under Failed head as shown in the above image.
3. You are redirected to a new page that has detailed reasoning behind the failure of each and every sync.