We recently installed the "Amazon Buy Shipping" feature in our setup for Amazon FBM orders, but then realized that ShipStation's "Recommended (Least cost)" feature is not searching Amazon Buy Shipping options. Here are 2 examples.
In both cases, Shipstation is INCORRECTLY recommending another shipping method instead of Amazon's UPS rates, which were the lowest.
I am wondering if the ShipStation (and Amazon) UPS rates shown are actually understated due to residential delivery and fuel surcharges, etc.