QB Issue Resolution:

Answer 1: No it is not, all you can do is check the audit log periodically

Answer 2:

Thanks for joining us again. I see that you’re needing to set up a notification when an invoice is deleted.

At this time, it isn’t available but, there is a way to see these invoices when they do get deleted in the Audit Log.

1. Go to the Gear icon.
2. Choose the Audit Log under Tools.

This is where you can see everything done in the account. You can change the date or just customize it.

I can also leave feedback to our Product Development Team about this so it can be considered as a new feature.

Resolution for Issue 'Are we able to set up our company to send a notification when an invoice is deleted? Any time that an invoice is deleted, we would like to get a notification. Is this possible?' available: Yes (Solved).
Source: Intuit Community forum.

Are we able to set up our company to send a notification when an invoice is deleted? Any time that an invoice is deleted, we would like to get a notification. Is this possible?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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