Overview

Effective January 24 2025, Amazon’s Buy Shipping service lifts the previous rule that allowed only one carrier account per U.S. seller. Sellers can now attach several accounts from the same carrier, giving them the ability to route individual shipments through the most appropriate account. This change matters to anyone managing multiple brands, warehouses, or product lines because it aligns shipping logistics with real‑world business structures.

Key Points

• Multi‑account carrier linking — U.S. sellers may now associate two or more accounts from a single carrier within Buy Shipping, ending the historic one‑account limit.
• Per‑shipment account selection — When creating a label, sellers can pick which carrier account to use, enabling use of distinct rate tiers or service levels on a shipment‑by‑shipment basis.
• Dedicated management hub — All linking, editing, and removal of carrier accounts are performed on a new “Carrier Account Management” page inside Seller Central.
• SP‑API v2 backward compatible — Existing label‑generation code continues to work; the carrier‑account ID is now an optional field that can be supplied without breaking current integrations.
• U.S. marketplace only — The feature is currently restricted to sellers operating on Amazon.com; no rollout dates have been announced for other regions.

How Multi‑Account Carrier Linking Works

1. Access the Carrier Account Management page — A seller logs into Seller Central, navigates to Settings → Buy Shipping → Carrier Account Management, and clicks “Add New Account.” For example, a seller using UPS can add a second UPS account that holds a different negotiated discount.
2. Enter carrier credentials and verify — The seller supplies the new account’s login, API key, or other authentication details required by the carrier. Amazon validates the information in real time; a failed verification (e.g., an expired UPS credential) prompts an error message, preventing the account from being saved.
3. Set a default account (optional) — After the account is saved, the seller may designate it as the default for routine shipments. For instance, a seller could set Account A as the default for standard ground shipments while leaving Account B available for occasional air‑freight orders.