Approval notifications to be disabled once invoice is approved

Summary:

Content (required):

We have the option of enabling/disabling notifications for invoice approval once the task is complete which includes approved as well as rejected. We need the notification to be disabled once the invoice is approved but need the notification to come when the invoice is rejected. Please let me know if there is any option for this.

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):