Send purchase orders to prep without leaving Seller Assistant
Seller Assistant integrates directly with leading Amazon prep centers. Connect yours and dispatch purchase orders as inbound shipments in one click.
Get StartedFrom a purchase order to units received at prep
Watch a purchase order go to the prep center and come back as expected, good and damaged units, in about two minutes. Pick a chapter to start at that step.
Connect your prep center and send your next PO in one click.
A growing network of integrated prep centers
Connect any prep center from the directory below. New prep centers are added regularly.
1 Stop Prep
FBA prep, FBM, D2C orders, and returns recovery with 48h turnaround.
1st MAD Prep
Amazon SPN prep with 24h labeling, plus FBM, Miravia, and eBay orders.
3P Shipping
FBA prep, Shopify and pick-and-pack fulfillment, plus returns handling.
3PL Fulfillments
FBA prep with photo-verified QA, SPD/LTL booking, and container devanning.
4D Fulfillment
FBA prep in 24-36h plus FBM, kitting, returns, and multichannel orders.
503 PREP
FBA prep, bundling, and FBM order processing since 2017.
5507 Logistics & Prep
FBA and FBM prep with FNSKU labeling, kitting, and direct Amazon shipping.
A & M Prep
Prep, storage, and order fulfillment with a portal synced to Amazon.
Run a prep center?
Integrate with Seller Assistant and get listed here. Sellers send you purchase orders in one click.
3 steps between you and your first prep dispatch
No technical setup. Just your prep center credentials.
Everything that connects when you plug in your prep center
No manual steps. No portal switching. Just the workflow, connected.
Warehouse sync
Your prep center warehouses appear in Seller Assistant automatically — no manual entry.
One-click dispatch
Assign a warehouse to a PO and send it to prep in one click from the order header.
Live shipment link
After dispatch, a live link to the shipment appears directly in the PO header.
Unlink and resend
Unlink any dispatched shipment and resend to a different prep center when needed.
Built into your daily workflow
The integration connects directly to your sourcing and fulfillment workflow.
Manage all warehouses and synced prep centers in one shared database.
SourceAssign warehouses and dispatch orders to prep directly from the PO header.
SourceLink a warehouse to a supplier so the correct ship-to is applied automatically.
SourceTrack inbound shipments after your prep dispatches inventory to Amazon.
ListFrequently Asked Questions
Visit Help CenterDo I need a separate account to use prep center integrations?
Can I connect more than one prep center to Seller Assistant?
Where do I find my Merchant ID and API Token?
What happens if I disconnect my prep center?
What happens to linked shipments if I switch prep centers?
My prep center is not in the directory — can I still use this integration?
Ready to connect your orders to prep?
Centralize your warehouses, sync your prep center, and send purchase orders to prep without leaving Seller Assistant.
Get StartedNot sure which plan fits your sourcing workflow? Chat with our team — we're happy to help.