Quotes in ShipEngine are as accurate as possible when requested, but discrepancies in the rate selection, weight, size, or other variables of your shipment may change the final fee sent by the carrier.
After UPS and FedEx deliver a package, there can be changes to your invoice for the following reasons:
The quote was for delivery to a commercial address, but the driver determined it was a residential address.
The order weight on the label was different from the weight the driver recorded.
You chose "Daily Pickup" as the rate type but then dropped it off at the customer counter.
Your selected Ship From location had incomplete origin information.
Your UPS negotiated rates were not fully set up in ShipEngine.
The reason for any changes should be listed on the invoice.
For example, below is the cost breakdown for a shipment that was initially requested as a commercial address but was determined to be a residential address by the carrier. In this instance, a residential address shipment added $3.20 to the total cost, as shown in the final invoice.
Commercial vs. Residential Address Validation
ShipEngine uses the Stamps.com address verification service for domestic shipments, which may not always align with the determination made by private carriers. There may be instances where an address is marked as commercial by ShipEngine, but a private carrier recognizes the same address as residential and tacks on additional fees at delivery.