Shopify Fulfillment Native Shopify integration with near-real-time inventory sync. Built for Shopify brands shipping under 10K orders a month.
What standard Shopify fulfillment covers
Vertex's Shopify 3PL fulfillment covers brands shipping anywhere from 200 orders per month up to roughly 10,000. Above that, a brand typically lives on Shopify Plus, and our Shopify Plus tier picks up the additional enterprise features (Functions, B2B, expansion stores, Markets). Below the 10K-orders threshold, the standard Shopify tier is the right fit, and the integration math is identical: same GraphQL surface, same webhook subscriptions, same Flow triggers.
The difference between this and the default 3PL Shopify integration is what runs underneath. Most 3PLs sit a middleware platform between Shopify and their WMS: ShipStation, ShipHero, Cin7, ShipBob, or a custom Zapier graph. Middleware sync runs on a schedule (hourly is typical, 15-minute is the floor) and translates Shopify events into the 3PL's own data model on the way in, then translates fulfillment events back on the way out. The translation step loses fidelity in both directions and the schedule means your cart shows stock that left the building 50 minutes ago.
We connect to your shop directly. The Admin GraphQL API at version 2025-10 is the source of truth. We subscribe to twelve webhooks, call eight mutations, and the entire integration surface is owned by the Vertex platform team. No middleware vendor sits in the critical path of an inventory update.
We run the Shopify Admin GraphQL API at the current stable version (2025-10), with a rolling upgrade path to each new quarterly release. No REST-only middleware sits between your store and our WMS. Every order, fulfillment, inventory, and return flow uses the GraphQL surface directly, which means new Shopify features ship into your account when Shopify ships them, not when a third-party connector finally updates.
Vertex registers as a Shopify Fulfillment Service on your shop with its own physical location. That matters because fulfillment-service location handling drives line-item commit, unfulfilled-hold, fulfillment-order routing, and the Inventory Levels API behavior. We are not a generic app pushing orders; we are a registered location, which is how Shopify's 2024-2026 Fulfillment Orders model expects 3PL integration to work.
We consume inventory_levels/update webhooks both directions and push deltas back via inventoryAdjustQuantities. Receipts, picks, returns, cycle counts, and damages all hit Shopify in near-real time of the physical event. Hourly CSV sync, the default for most 3PL Shopify integrations, simply does not exist in our stack.
For brands that show live shipping rates at checkout, we expose carrier rates to Shopify via the Carrier Service API. Cart-level rate shopping picks the cheapest service for the cart weight, dim, destination, and SLA requirement, then writes the chosen rate back to Shopify in time for checkout completion. Brands that use Shopify's built-in flat-rate or zone-rate logic also work; we honor whichever model you have set.
The 5 things we built natively for Shopify
Each one solves a real operational problem that middleware-based Shopify integrations create. The combined effect on a sub-10K-orders-per-month brand is the difference between an integration that runs itself and an integration that needs a part-time engineering hire to babysit.
Real-time stock push to Shopify in near-real time after any physical event.
Every receipt, pick, putaway, return, cycle count, and damage adjustment hits Shopify in near-real time. We listen to inventory_levels/update webhooks in one direction and call inventoryAdjustQuantities (with an idempotency key per event) in the other. Most 3PLs sync hourly through middleware (ShipStation, ShipHero, Cin7, or a Zapier setup), which means your Shopify cart shows stock that left the building 50 minutes ago. Subscription brands and BFCM-peak operators get true real-time stock visibility, which means you stop overselling on the last 5 units of a hero SKU.
Anchor stat
Near real-time
Inventory delta cadence from physical event to Shopify stock update
Pre-built triggers covering order routing, inventory, customer tagging, and returns for the standard-tier brand.
Shopify Flow is the automation engine inside every Shopify plan above Basic. We publish a library of pre-built triggers tuned for sub-10K-orders-per-month brands: high-AOV routing, multi-item kit routing, VIP customer tagging, international order tagging, inventory threshold alerts, cycle count variance reports, return-received inspection, and more. Each trigger fires from a Vertex floor event into Shopify Flow, which means your existing Flow workflows (Klaviyo segments, CRM tagging, fraud reviews) keep working without an integration project.
Anchor stat
Library
Pre-built Flow triggers tuned to the standard Shopify tier
We accept fulfillment orders the way Shopify's 2024-2026 model expects, not the legacy single-fulfillment-record way.
Shopify deprecated the single-fulfillment-record model in favor of Fulfillment Orders. Every order line item routes through a fulfillment order tied to a specific location, with explicit accept, reject, hold, and cancel states. We accept fulfillment orders via fulfillmentOrderAccept (or the deprecated assigned-fulfillment-order endpoint where a legacy app still requires it), respect hold requests from merchant-side workflows, and reject only when we have a documented stockout or DSC failure. Reject reasons land in Shopify with the actual reason code, not a generic "could not fulfill" string.
Anchor stat
Native
Fulfillment Orders model native, no legacy fulfillment record path
We write operational tags back to the order so Shopify Flow and your CRM see what happened on our floor.
When a pick exception fires, when a return clears inspection, when an order ships above the AOV threshold, when a fraud screen flags an order, when an order routes to peak hold: every one of those events lands as a Shopify order tag (vertex:pick-exception, vertex:return-cleared, vertex:high-aov, vertex:fraud-hold, vertex:peak-hold). Your Shopify Flow workflows, your Klaviyo segments, and your Gorgias macros can all read those tags directly. This is the single biggest reason brands move off middleware-based 3PL integrations: the middleware never writes the floor reality back to Shopify.
Anchor stat
Library
Operational tags we write back to Shopify orders
Returns created in Shopify resolve to inspection, restock, refurb, or scrap in our WMS, with the resulting refund and inventory event written back.
Shopify added native Returns in 2023 and the Returns API surface keeps expanding. We accept return requests from Shopify (or from Loop, Aftership, Happy Returns, or ReturnGo if you run a returns platform on top), receive the parcel, inspect, and post the result back to the return: cleared for restock writes a positive inventory delta and a return event; refurb or scrap writes a zero-restock event with a reason code. Your CSAT dashboard sees the return resolution; your finance team sees the refund issued; your buying team sees the damage trend per SKU. All of it is one API surface, not a custom integration project.
Anchor stat
Prompt
Return-to-refund-issued cycle from carrier scan
Real operational detail
For the technical buyer evaluating Shopify 3PL options: here is the exact API surface we operate. No hand-wave, no "we connect to Shopify" generalities. Twelve webhook subscriptions in, eight mutations out, and the inventory adjustment idempotency model that keeps double-writes from showing up as oversell.
Webhooks we subscribe to
orders/create orders/updated orders/cancelled fulfillment_orders/order_routing_complete fulfillment_orders/cancellation_request_submitted fulfillment_orders/hold_released inventory_levels/update inventory_items/update returns/request returns/approve returns/decline returns/cancel Mutations we call back into Shopify
fulfillmentCreate (with tracking + line items) fulfillmentOrderAccept / Reject fulfillmentOrderHold / ReleaseHold inventoryAdjustQuantities (with idempotency key per event) inventorySetQuantities (cycle count reconciliation) returnRefund + returnLineItemRemoveFromReturn orderUpdate (writing operational tags back) fulfillmentEventCreate (in-transit milestone events) Inventory adjustment example
Every inventory adjustment we send to Shopify includes a per-event idempotency key and a reference URI back to the WMS event. The reference URI looks like vertex://wms/pick/2026-05-10/PCK-008412, which means any oversell investigation traces back to the exact pick event in our WMS within a minute, not a multi-hour CSV reconciliation. The mutation we call is inventoryAdjustQuantities with a delta value, a reason code (pick, receipt, return-restock, damage, cycle-count), and the idempotency key. Shopify's GraphQL surface accepts the call and returns the resulting InventoryAdjustmentGroup ID, which we store on the WMS event for the audit trail.
15 Shopify Flow triggers
Fifteen pre-built triggers tuned to brands shipping under 10K orders per month. Each fires from a Vertex floor event into your Shopify Flow workflows. Filter by category. (Plus brands get a 35+ trigger library on the Shopify Plus page.)
Showing 15 of 15 triggers
Orders above $250 AOV route to a priority pick lane with same-day cutoff.
Multi-item orders route through the kitting station before the pick wall.
VIP-tagged orders ship in branded packaging with handwritten thank-you card.
Non-US orders route to the commercial invoice and harmonized code workflow.
Local pickup orders skip the carrier label step and route to the pickup queue.
Fires when a SKU drops below your configured reorder point in our WMS.
Notifies merchandising when a PO arrives and stock becomes available to sell.
Fires when a cycle count variance exceeds 2% of on-hand for a SKU.
Reports damaged units removed from sellable count during receiving or returns.
Tags customers who place a 3rd order for downstream loyalty workflow.
Tags customers with refund rate above 20% for review on next purchase.
Tags non-US customers for region-specific email and SMS segmentation.
Return arrives at our facility; routes to inspection workflow.
Inspected return cleared for resale; inventory delta pushed to Shopify.
Return failed inspection; routes to refurb queue or scrap, not sellable stock.
Pricing
The same pick, storage, and kitting rates we publish on the rest of the site. Shopify volume runs on the standard rate card with no integration surcharge, no Plus markup, and no minimum-monthly-volume penalty.
Pick fee
from $1.05
Per pick on standard parcel SKUs. No Shopify markup.
Storage
Custom
Per cubic foot, per month, on standard ambient storage.
Order minimum
200
Orders per month minimum. No upper cap on the standard tier.
Shopify integration setup
$0
Admin GraphQL connection, webhook subscriptions, Flow triggers, included.
Full rate card (returns, special handling, palletization, freight, carrier rate shopping fees) lives at /pricing. Shopify volume runs on the same card.
Where we run this
Standard Shopify fulfillment runs out of our US east-coast and west-coast facilities for ground-shipping coverage to most of the US population on standard carrier service. Brands selling into Canada at meaningful volume route through our Canadian sister facility in Mississauga, with a CUSMA-compliant bulk transfer lane that moves duty-paid inventory across the border on a regular cadence. The two storefronts (yourbrand.com and yourbrand.ca, or a single store using Shopify Markets) draw from one logical inventory pool with location-aware allocation in Shopify.
For brands shipping primarily out of one coast or running a single-DC operation, we deploy the full Shopify integration against one location. Multi-DC brands get separate fulfillment-service location registrations per DC, with order routing driven by zip-code lookup at the fulfillment-order assignment step. Either configuration runs on the same near-real-time sync model.
Ready to migrate Shopify volume?
Direct Admin GraphQL on a current API version. Inventory Levels API webhook delta sync in near-real time. Shopify Flow trigger library. Native Fulfillment Service registration. Standard Vertex pick and storage rates with zero integration setup fee.
Related Shopify pages
