UPS Quantum View is one of the most comprehensive reporting APIs available on UPS XML, and yet it's one of the least used API. It provides complete reporting of every shipping activity your organization is engage in. It is a comprehensive suite of services that give you details about your UPS shipments. It can be used to update your ERP with tracking numbers, scheduled and actual delivery dates, and exceptions. The catch is that you'll have to use PackageReferenceNumbers to correlate the package with your sales order number.