Same problem, different leaks. The QuickBooks connector has its own list of what it does not carry. The reconciliation approach is identical: read both, match, surface exceptions.
Adjacent, but most integration work moves data in one direction and calls it done. Reconciliation assumes the movement already exists and audits it, which is what the monthly meeting actually needs.
The first exception report is usually running inside a few weeks, because it reads what already exists. It gets sharper as it learns which mismatches your firm considers normal.