Quickbooks: Invoice date paid

I have customers looking to use Brightgauge to make more digestible reports for their sales teams.  We can ingest most of the data we're looking for right from Quickbooks but the "date paid" field isn't ingested?  This feels like a critical oversight for an invoicing dataset.  There's the "is paid" flag but not a date field in sight.  We would love to see this added to the base dataset from the Quickbooks datasources.