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Inventory & order sync

Why this matters for your business​

Multichannel only works if inventory + orders stay accurate. Get this wrong and you sell the same unit on Amazon AND eBay AND Shopify within the same hour — three orders, one unit, two disappointed customers and a refund. Or marketplace orders sit in marketplace dashboards while Shopify (and your fulfillment) doesn't know about them. The operational chaos of poorly-synced channels is why most stores either stay single-channel or hire someone full-time to manage it.

Inventory + order sync solves this with real-time bi-directional sync. Sell a unit anywhere → all channels reflect within seconds. Marketplace orders → flow into Shopify automatically, showing up alongside Shopify-direct orders. One operations process for all channels.

What this typically unlocks​

OutcomeResult
Oversell rate (multi-channel)near 0
Order processing in one placeall channels in Shopify
Time on order import0 (automatic)
Sync latency< 30 seconds typically

What you actually get​

CapabilityDescription
Inventory syncReal-time across all channels (webhook + polling fallback)
Price syncReal-time; respects per-channel pricing rules
Order importMarketplace orders flow into Shopify orders/create webhook
Customer matchingMarketplace orders match to Customer 360 if email/phone known
Fulfillment syncWhen you ship via Shopify, marketplace gets fulfilled
Conflict detectionSame SKU sold on 2 channels in same second → first wins, second cancels
Buffer stockReserve safety stock per channel (e.g. "always keep 2 units off marketplaces")

How it works​

Sub-30-second latency typical; sub-5-second when webhooks fire correctly (most channels do).

Real merchant scenarios​

Scenario A — Brand sells last unit; no oversell​

Setup. Brand had 1 unit of a popular SKU. Same hour:

  • Amazon order at 14:23:01
  • Shopify-direct cart-add at 14:23:02

What happened:

  • Amazon order won (placed first)
  • Inventory deducted to 0 across all channels by 14:23:08
  • Shopify cart-add went through to checkout but inventory showed 0 → customer saw "out of stock" before paying
  • Net: 0 oversell

Without real-time sync, the Shopify customer would have paid for stock that didn't exist.

Scenario B — Marketplace order flows into Customer 360​

Setup. Existing Shopify customer (jane@x.com) buys on Amazon for the first time using same email.

Flow:

  • Amazon order arrives
  • Order imported as Shopify order
  • Customer matched to existing Customer 360 (email match)
  • POS counter increments, total spend updates, lifecycle re-evaluated

Result: Brand sees Jane's full purchase history including Amazon. Without unified Customer 360, Amazon Jane would have been a separate "anonymous" record.

Scenario C — Buffer stock prevents marketplace stock-out​

Setup. Brand wanted to keep 5 units of best-seller off marketplaces (always available on Shopify).

Rule: Buffer stock 5 on Amazon + Etsy.

Result: When Shopify shows 8 units, marketplaces show 3. When Shopify shows 5, marketplaces show 0. Always reserves some for direct sales.

Best practices​

✅ Set buffer stock for high-velocity SKUs. Marketplaces move fast; Shopify-direct customers hate "out of stock."

✅ Verify sync latency monthly. Run a test: change inventory in Shopify, check 30 sec later on each channel.

✅ Match marketplace customers to Customer 360. Email match is automatic; matters for unified marketing.

❌ Don't disable sync to "fix a problem." Disabled sync is where oversells start.

❌ Don't manually edit inventory in marketplace consoles. Always update in Shopify; let sync push. Manual changes cause drift.

Plan tiers​

CapabilityFreeStarterProAgencyEnterprise
Real-time inventory sync—✓✓✓✓
Real-time price sync—✓✓✓✓
Order import—✓✓✓✓
Customer matching—✓✓✓✓
Buffer stock per channel——✓✓✓
Conflict detection—✓✓✓✓
Multi-warehouse routing———✓✓

See also​