Orders reach the same warehouse system
Every order, from every channel, lands in the OC3PL warehouse management system regardless of how it got there.
ShipStation Hub, or a Direct Integration?
Two routes into the same warehouse. The difference is setup, not capability.
The Hub Exists for What Direct Cannot Reach
OC3PL connects most platforms straight into the warehouse management system, and separately runs ShipStation as a hub. The hub is the backup integration path for any store that cannot be mapped directly — and the fast path for anyone already running several channels through ShipStation today.
One or two mainstream platforms: go direct
If you sell on Shopify, or on a marketplace with a supported connector, a direct connection is fewer moving parts and is live the same business day.Already running ShipStation: use the hub
Every channel you have mapped flows across at once with no per-channel setup. The work you already did is the setup.A platform with no connector: the hub is the answer
If a store cannot be mapped directly, ShipStation is the route in rather than a blocker.The turnaround differs
Direct connections are live the same business day. Hub connections take two to three business days.
How to tell which you want:
Choosing a Route
A direct connection maps your store straight into the OC3PL warehouse management system. The hub routes orders through ShipStation, which OC3PL runs as a hub and which serves as the backup integration path for any store that cannot be mapped directly. Direct connections are live the same business day; hub connections take two to three business days. Everything after the connection is identical.
Go direct if you sell on one or two mainstream platforms with supported connectors — it is fewer moving parts and faster to live. Use the hub if you are already running several channels through ShipStation, because they all flow across at once with no per-channel setup, or if your platform has no direct connector.
No. Orders reach the same warehouse management system, draw on the same single inventory pool, and push tracking and inventory back the same way. The route in is a setup decision rather than a capability one — the practical difference is the two to three business day turnaround instead of same day.
What Does Not Change Either Way
The route in is a setup decision. What happens afterwards is identical.
One inventory pool
Stock is not split by route. Direct and hub channels draw on the same position.
Tracking syncs back the same way
Inventory levels and tracking numbers return to the platform that notifies your customer.
Setup work is still ours
Mapping, SKU matching, test orders and go-live are handled either way. The ask from you is a credential or an app install.
Related Reading
The detail behind this, in OC3PL’s own guides.
ShipStation Fulfillment Integration
How OC3PL connects to ShipStation — directly to the warehouse management system, and as the hub that carries every channel you have already mapped.
ShipStation and a 3PL: How Connecting Works
ShipStation has a purpose-built way for a 3PL to work in your account. What a connected user is, what your orders look like on their side, and what you keep control of.
How OC3PL Integrations Work | WMS, API Keys and Go-Live
What connecting a store to OC3PL actually involves: one warehouse management system, an API key or app install from you, and mapping, SKU matching and test orders from us.
Multichannel Fulfillment From One Inventory Pool
Running a storefront and two marketplaces from one stock pool: how allocation works, what breaks when you split inventory per channel, and what to confirm before you do.
When Your 3PL Can’t Integrate With Your Tech Stack
Discover the risks of poor 3PL integration, including fulfillment errors, inventory issues, and support tickets, and why a tech-forward partner is key.
Why API Flexibility Matters in a Fulfillment Partner
Discover why a flexible API is critical for scaling e-commerce brands. Learn how custom API support from a 3PL solves complex fulfillment challenges.
Pick Your Route
Tell us what you sell on and whether you already use ShipStation, and we will tell you which route is faster for you.