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Connect Flat Fee Shipping to Katana

Import Flat Fee Shipping orders, fulfillments with tracking, inbound shipments, and warehouse stock into Katana.

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Written by Argo Ohvril

What the Katana–Flat Fee Shipping integration does

Flat Fee Shipping is a full-service eCommerce fulfillment partner. Its services include order fulfillment, inventory management, kitting and assembly, worldwide shipping, and multi-channel eCommerce fulfillment.

By connecting Katana with Flat Fee Shipping, you can:

  • Import orders as sales orders: Each Flat Fee Shipping order becomes a Katana sales order, and shipped packages arrive as fulfillments with carrier and tracking details.

  • Import products by SKU: Products match existing Katana items by SKU, and SKU aliases can bridge mismatched SKUs.

  • See stock levels at mapped locations: Flat Fee Shipping stock appears in Katana as read-only external inventory at each mapped location.

  • Track inbound shipments as stock transfers: Each inbound shipment becomes a Katana stock transfer that updates as stock is received.

  • Map warehouses to locations: Each Flat Fee Shipping warehouse links to its own dedicated Katana location.

sync diagram showing data flowing one way from Flat Fee Shipping into Katana: orders and fulfillments with tracking into Katana sales orders, products into Katana items by SKU, stock levels into read-only external inventory at mapped Katana locations, and inbound shipments into Katana stock transfers

Before you start

  • An active Flat Fee Shipping account.

  • The credentials the Katana connection form asks for: your Flat Fee Shipping API Username and Password. Your Flat Fee Shipping representative sets up this API access.

  • A Katana account with permission to manage integrations.

Connect Flat Fee Shipping to Katana

  1. In Katana, open the Integrations page and find the Flat Fee Shipping tile.

  2. Click Connect.

  3. Enter your Flat Fee Shipping Username and Password, then confirm.

    the Katana connection form for Flat Fee Shipping with the Username and Password fields and the confirm button

  4. After Flat Fee Shipping approves the connection, the configuration screen opens on the Location tab. The integration status shows Connected with Sync inactive, and an Activate sync button appears in the header. Map each Flat Fee Shipping warehouse to a Katana location. Use Add to Katana to create a dedicated location for a warehouse.

    the warehouse location mapping panel on the Location tab, listing Flat Fee Shipping warehouses with their mapped Katana locations, an Add to Katana button, and the Connected and Sync inactive status with the Activate sync button in the header

  5. Click Activate sync to start syncing data with Flat Fee Shipping. Nothing syncs until you do this.

How your daily workflow looks

  1. Orders reach Flat Fee Shipping from your sales channels, and Flat Fee Shipping picks, packs, and ships them.

  2. Orders import into Katana as sales orders once they reach your configured import-from status. They keep updating as their status changes.

  3. Shipped packages appear in Katana as fulfillments with carrier and tracking details.

  4. Inbound shipments to Flat Fee Shipping appear as Katana stock transfers, and received quantities update them.

  5. Flat Fee Shipping stock levels show as external inventory at your mapped locations.

  6. You plan purchasing and production in Katana using this up-to-date picture.

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