Why migration feels scary (and why it shouldn't)
The real fear isn't changing providers: it's going dark on sales during the switch. Planned well, a migration to a 3PL —a provider that receives, stores, picks, and ships your orders— runs in parallel: you keep shipping from where you are while the new center gets ready, and the customer notices nothing.
The difference between a calm migration and a headache isn't the provider — it's the order in which you do things.
Before moving a single box (the pre-flight checklist)
- Clean up your SKU catalog. A SKU is each product variant (size, color, format), with its code, photo, and weight. If your catalog is messy, the new center inherits the mess.
- Do a real physical count. The number you hand the 3PL is the number you'll be able to sell. Accurate inventory control at launch keeps you from canceling orders in week one.
- Define how it integrates with your store. How stock will sync with Shopify, Mercado Libre, or Amazon to avoid overselling (selling what you no longer have).
- Agree on the SLA. What share of orders ship on time, how fast, and what happens when something fails.
The step-by-step
- Integration. Your store connects to the operator's system so orders flow in automatically and stock stays synced.
- Catalog onboarding. Your SKUs are loaded into the 3PL's system with their codes, dimensions, and packing rules.
- Inbound (the incoming goods). You send inventory to the new center; it's received, counted against your count, and put away in its location.
- Parallel run. For a few days, both operations coexist: new orders already ship from the 3PL while the old operation runs down its remaining stock.
- Cutover (the firm switch). Once stock and integration are verified, all order routing moves to the 3PL and you turn off the old setup.
The mistake that does stall sales
Cutting over cold. Turning off your old operation the same day you switch on the new one —with no overlap or verification— is the recipe for 48 hours where you can't ship. The parallel run exists precisely so there's never a day when you can't sell.
How long it takes
It depends on catalog and inventory size, but a typical e-commerce migration runs one to three weeks, from the first count to cutover. A clean catalog and a solid count are what shorten the process most.
Frequently asked questions
Will I stop selling during the migration?
No, if it's done in parallel. You keep shipping from your current operation while the new center gets ready, and you only switch routing once everything is verified.
How long does it take to migrate to a 3PL?
Usually one to three weeks. Catalog size, how clean your data is, and how fast the physical count goes are what weigh most.
What do I need ready before starting?
A clean SKU catalog, a real physical count, and clarity on how it integrates with your store. With that, the operator handles the rest.
What happens to orders already in transit?
They ship from your previous operation. The parallel overlap exists exactly to cover those orders so none are left half-finished.
Ready to move your operation without stalling sales? See Ecommex fulfillment: we integrate, receive your inventory, and run in parallel so the switch doesn't cost you a single sale.