Most 3PL migrations fail not because the new provider is worse, but because the transition was run like a contract change instead of a logistics project. Orders get routed to a warehouse that has not received the stock, inventory counts diverge between two systems, and the cutover lands in the middle of a promotion. Sellers who plan the overlap period, the inventory transfer and the data migration as three separate workstreams move without their customers noticing. This checklist covers what to plan.
Principais Lições
- Run an overlap period; a same-day cutover with zero buffer is the most common cause of a failed migration.
- Decide the inventory transfer method (physical move vs sell-through vs split) before signing, because it drives the timeline.
- Migrate SKU master data and integration in parallel, then re-verify counts against a physical count, not the old system.
- Freeze promotional launches during cutover; a migration week is the worst week to test anything else.
- Never cut over during peak season unless the current provider is failing.
Phase 1: Before You Sign Anything
The migration starts before the new contract. Two things must be settled while you still have leverage: the exit terms with the current provider and the overlap arrangement with the new one.
| Decisão | Why it must come first | What to confirm |
|---|---|---|
| Exit notice and final invoice terms | Determines when you can stop paying the old provider | Notice period, final billing basis, minimum spend already committed |
| Inventory release | Your stock is physically in their building | Pick-and-pack out, count verification, and who pays the labour |
| Overlap window | Defines whether orders can flow during the move | Whether the new provider will receive before the old one releases |
| Data export | You need your own history regardless | What data you get, in what format, and when |
Ask for your data export early and in a usable format. Order history, SKU dimensions and weights, and inventory snapshots are yours commercially even when the contract is quiet about them. The comparison discipline that got you to this decision is covered in nossa quebra de preços de 3PL.
Phase 2: The Inventory Question
Inventory is the hardest part of any migration, and there are only three realistic options. Each has a different cost, risk and timeline.
| Opção | Como funciona | Best when | Main risk |
|---|---|---|---|
| Physical transfer | Pick, pack and ship all stock to the new warehouse | You want a clean break and can absorb freight | Transit loss, count discrepancies, double handling cost |
| Sell-through | Leave stock at the old provider until it depletes | Low inventory or a long overlap window | Two providers billing simultaneously; split shipments |
| Split inventory | Fast movers move, slow movers stay | Mixed velocity catalogue | Routing logic complexity; two stock pools to reconcile |
Whichever option you choose, insist on a physical count at both ends. A system-to-system transfer moves the old provider’s counting errors into the new provider’s system, where they become your problem for the next year. The receiving and verification discipline is described in nosso guia de fluxo de fulfillment de pedidos.
Phase 3: Data and Integration
The technical migration is usually underestimated because it looks like a file copy and behaves like an integration project.
| Workstream | What moves | Common failure |
|---|---|---|
| SKU master data | Dimensions, weights, barcodes, packaging specs | Weights missing or stale, causing wrong shipping rates |
| Store integration | Order routing, tracking sync, inventory feed | Both providers connected at once, double-shipping orders |
| Historical data | Order history for returns and analytics | Export arrives after the old account is closed |
| Customer-facing rules | Cut-off times, carrier selection, packaging inserts | Assumed to carry over; they do not |
The double-connection failure deserves emphasis. During the overlap, if both providers can receive orders from your store, a routing mistake ships the same order twice. Disable the old provider’s order feed the moment the new one is live, and verify by placing a test order rather than by checking a settings screen.
Phase 4: Cutover Rules
Cutover is a sequence with hard gates, and each gate needs a verification step before the next one opens.
| Gate | Verification before proceeding |
|---|---|
| Stock received and counted | Physical count matches the new WMS, discrepancies logged |
| Integration live | Test order routes, ships and returns tracking correctly |
| Old provider disabled | Test order does not reach the old warehouse |
| Old provider stock released | Final count agreed and final invoice reconciled |
Freeze promotional launches for the cutover window. A migration week already tests your routing, inventory and integration; adding a campaign tests them under load, which is how a recoverable problem becomes a lost weekend. If the move must happen near a peak, the multi-warehouse approach in nosso guia de múltiplos armazéns is usually safer than a hard cutover.
Perguntas Frequentes
How long does a 3PL migration take?
Typically four to eight weeks for a small catalogue, longer if inventory must physically move or an integration must be built. The inventory transfer method, not the contract, sets the timeline.
Should I run both 3PLs at the same time?
Briefly, yes — an overlap window prevents a gap in fulfilment. But disable the old provider’s order feed as soon as the new one is verified, so orders cannot be routed twice.
How do I transfer inventory safely?
Physical count at both ends, documented discrepancies, and one agreed transfer method. Never move stock on system-to-system counts alone; you inherit the old provider’s errors.
What data should I export before leaving a 3PL?
Order history, SKU dimensions and weights, inventory snapshots, and any customer-facing rules such as cut-off times and carrier selection. Request it early, in a usable format.
Can I switch 3PLs during peak season?
Only if the current provider is failing. A cutover during peak tests routing, inventory and integration under maximum load, which is when problems are least recoverable.
What is the most common migration mistake?
A same-day cutover with no overlap and no buffer. The second most common is migrating SKU weights without re-verifying them, which silently breaks shipping-rate calculations.
How do I choose the right 3PL in the first place?
Compare providers on a modelled order profile at your real volume, not headline rates. The selection framework is covered in our guide to choosing the best 3PL for dropshipping.
Contexto técnico: logística de terceiros, data migration e change management explain the operating model and the disciplines referenced above.
