Amazon Seller Flex Integration: Streamline Orders From Your Own Warehouse

Amazon Seller Flex lets you fulfill Prime orders directly from your own warehouse using Amazon's logistics network. You keep the stock in your facility and handle shipping yourself while still meeting Amazon's delivery standards. Full control over logistics and costs, without giving up the Prime badge.

Base's Amazon Seller Flex integration is built directly into the panel - no extra plugins needed. It runs on the Amazon SP-API, which automates order, parcel, and status updates in near real time. Dedicated APIs handle shipments, labels, and pickup windows.

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Where Seller Flex Gets Complicated - And How Base Fixes It

Warehouse and Amazon Location, Always in Sync

Managing inventory mappings manually leads to misallocated stock and missed SLAs. Base automates this through Seller Flex WMS multi-warehouse mapping, letting you link Amazon locations directly to your facilities and assign stock feeds per account. The moment stock moves in Base, it syncs with Amazon automatically.

Automated Shipping Labels & Tracking Sync

Switching between systems to generate labels and push tracking data back to Amazon burns time and creates errors. Base includes a dedicated Amazon Seller Flex carrier integration: create parcels, generate labels, and send tracking numbers and carrier data back to Amazon directly from the order view.

Automated Amazon Flex Pickup Window Scheduling

Coordinating pickup and delivery windows manually across multiple orders is where Seller Flex operations slow down. Base selects pickup windows automatically - recommended, earliest, or latest slots - so your team isn't making that call order by order.

India is one of the most active Seller Flex markets. Base supports Indian Seller Flex accounts fully within the same integration, with the right API settings applied automatically.

Real-Time Stock & Order Sync via Amazon SP-API

Prevent stockouts and overselling across all your sales channels. Built natively on the official Amazon Selling Partner API (SP-API) and Amazon Flex API, Base syncs stock movements, order statuses, and carrier pickup notifications in real time across your entire facility network.

Multiple Accounts, One Place

Connect any number of Amazon accounts and run Seller Flex alongside your other channels from one Base account. The panel detects your account's region automatically, applies the right settings, and keeps each location compliant with Amazon's requirements - without you managing the details.

How It Works

Seller Flex orders flow into Base via the Amazon Smart Connect API, alongside your other sales channels.

Base applies the right warehouse mapping, distribution channel, and pickup window for each order.

Your team creates parcels and labels using the dedicated Seller Flex carrier in Base.

Tracking numbers, statuses, and carrier data sync back to Amazon automatically.

Stock and handling time stay in sync across your Base warehouses and Amazon.

No extra plugins. No developer required.

Part of Your Broader Amazon Setup in Base

Seller Flex runs alongside every other Amazon program you manage in Base - Seller Central, Amazon Easy Ship, FBA, and more. Your Amazon orders sit in the same panel as your other marketplaces and stores, using the same automation rules and statuses. No separate tool, no separate login.

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