ShipStation should fully support Amazon Buy Shipping configurations where different Amazon warehouse / Ship From locations are tied to different carrier accounts within the seller’s Amazon account.
In our case, we use multiple UPS accounts with different negotiated rates. Amazon exposes those through different warehouse / Ship From configurations, so the available Buy Shipping rates can vary depending on which warehouse is used.
Amazon’s Shipping API supports multi-warehouse rating through the applicable registered shipFrom location. ShipStation should be able to request rates for each eligible Amazon Ship From location, return the carrier options associated with that location, and feed those results into Rate Shopper.
That would allow ShipStation to:
- Compare Amazon Buy Shipping rates across eligible Ship From locations
- Include the carrier accounts tied to those locations
- Select the cheapest valid option that still meets Amazon’s delivery promise
- Purchase the label through Amazon Buy Shipping using the selected rate
This is important for more than just convenience.
Without this functionality, we lose money on shipping because we cannot fully use all of the carrier accounts available within Amazon while still maintaining the protections tied to Amazon Buy Shipping and OTDR. We can end up selecting a more expensive rate under the default warehouse even though a cheaper valid option should be available through another warehouse/carrier-account configuration.
We have also consistently seen technical instability in ShipStation’s Amazon Buy Shipping integration when multiple carrier accounts are connected in Amazon. We encounter internal errors, failed rating behavior, and in some cases issues severe enough to effectively break the integration.
That makes this feel less like an enhancement request and more like a compatibility gap that needs to be fully addressed.
If ShipStation advertises Amazon Buy Shipping as a supported carrier integration, it should fully support the configurations Amazon sellers are allowed to use within Amazon Buy Shipping.
A seller should not have to simplify or remove legitimate carrier-account configurations just to keep the ShipStation integration stable.
For sellers relying on Amazon Buy Shipping protections, OTDR, and negotiated carrier rates, incomplete support creates real shipping-cost, workflow, and account-health consequences.