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Shopify Integrations · ERP · 3PL · API

Shopify wired into everything else.

Every serious Shopify store eventually needs to talk to something else: the accounting system, the warehouse, the CRM, the ERP. We've built integrations between Shopify and everything. Built clean, built to hold, with idempotent webhooks your ops team won't be babysitting at 2am.

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40+

Systems integrated

ERP, WMS, CRM, accounting, and custom

Data loss incidents

Across all integration builds to date

Real-time

Sync architecture

Webhooks + fallback polling, not cron jobs

5yr+

Longest running integration

Still running clean, no maintenance calls

The integration gap is where growth stalls.

A Shopify store in isolation is manageable. The moment you need it talking to QuickBooks, a 3PL, NetSuite, or a custom ERP — that's where most brands either slow down or start building a brittle patchwork of apps that breaks under volume.

The problem with most off-the-shelf Shopify integration apps isn't that they don't work — it's that they work until they don't. A Shopify–QuickBooks connector from the app store handles simple order sync fine. The moment your SKU naming convention doesn't match, or you have a custom tax treatment, or you need credit memos mapped to refunds — the app hits a wall and your ops team starts manually reconciling data in spreadsheets.

Custom-built integrations cost more upfront and take longer to launch. The tradeoff: they handle your actual data model, not a hypothetical average one. They have error handling that routes problems to a human rather than silently failing. And they don't disappear from the app store when the developer stops maintaining them.

We've been building Shopify integrations since 2017. Here's the categories we work in.

Integration categories

What we build.

From accounting sync to custom ERP wiring — these are the integration types we build regularly and know deeply.

Accounting

Shopify + Accounting Systems

Bi-directional sync of orders, refunds, fees, payouts, and inventory between Shopify and your accounting platform. We handle edge cases that app store connectors miss: partial refunds, discount codes, Shopify Payments fee reconciliation, multi-currency, and complex tax treatments. Data arrives clean, mapped to your chart of accounts, and reconciled automatically.

QuickBooks Online Xero Sage FreshBooks Wave

ERP

Shopify + ERP

Full ERP integration: order flow from Shopify into the ERP, inventory updates back to Shopify in real time, product catalog sync, customer data, and financial posting. We've connected Shopify to all of the major platforms and built custom middleware where direct connectors don't exist or aren't flexible enough. Includes error queuing, retry logic, and monitoring dashboards.

NetSuite SAP Microsoft Dynamics Brightpearl Cin7

Fulfillment

Shopify + 3PL / WMS

Order routing from Shopify to your 3PL, tracking number sync back, inventory reconciliation, multi-warehouse routing rules, and return processing. We build the integration layer between Shopify's order management and your warehouse system — clean enough that your ops team can manage by exception, not by monitoring every order individually.

ShipBob Flexport Whiplash Custom WMS Logiwa

CRM & Marketing

Shopify + CRM / Marketing

Customer data sync between Shopify and your CRM or marketing stack. Purchase history, LTV, product affinity, RFM segments — all flowing in real time into the tools your growth and retention teams actually use. We also build the reverse: customer attributes from your CRM reflected in Shopify for personalization and checkout customization.

Klaviyo Salesforce CRM HubSpot Attentive Postscript

Inventory & PIM

Shopify + PIM / Inventory

Product data sync from your PIM into Shopify — product titles, descriptions, images, variants, metafields, and inventory levels — kept in sync without manual export/import. We handle large catalog complexity: 10k+ SKUs, attribute inheritance, variant-level inventory, and multi-location stock routing that keeps your storefront accurate at all times.

Akeneo Salsify inRiver Custom PIM Linnworks

Custom & Misc

Custom API Integrations

Not everything fits a named category. We've connected Shopify to internal tools, legacy systems without APIs (scraping or EDI), custom pricing engines, loyalty point systems, subscription billing platforms, and industry-specific software. If your system has an API or a data export, we can wire Shopify to it. If it doesn't, we can usually find a way anyway.

Recharge Zapier / Make Zendesk EDI Bespoke

Engineering principles

How we build integrations that hold.

Most integration failures aren't bugs in the happy path. They're failures in edge cases, error handling, and what happens when one side goes down. Here's how we build against those failure modes.

01 Idempotent webhooks

Shopify webhooks can fire more than once. Any integration that processes a webhook without idempotency logic will create duplicate records — duplicate orders in your accounting system, duplicate inventory adjustments, duplicate shipments. We build deduplication into every webhook handler as a first principle, not an afterthought. Every message carries a unique ID; if we've seen it before, we skip it cleanly.

02 Failure queuing & retry

Integrations fail. The external API goes down, a rate limit is hit, a payload fails validation. The difference between a well-built integration and a brittle one is what happens next. We build explicit dead-letter queues — failed messages are captured, logged with context, and retried on an exponential backoff schedule. Your ops team sees a failure in a dashboard, not a silent data gap they find three weeks later.

03 Reconciliation layer

Real-time sync is the primary data flow. Reconciliation is the safety net. We build nightly or hourly reconciliation jobs that compare Shopify's state against the destination system and flag discrepancies — without auto-correcting them, which can make things worse. When a discrepancy is found, it surfaces for human review. This is how you catch the failure modes that real-time sync misses.

04 Observable by default

An integration nobody can monitor is an integration nobody trusts. Every integration we build includes a lightweight admin view: message volume, error rate, last successful sync time, and a searchable log of every transaction. This isn't for us — it's for your ops and finance teams. The goal is that whoever owns this workflow can self-serve on any question without pinging a developer.

05 Your data model, not ours

Off-the-shelf connectors map Shopify's data model to a generic schema. Your accounting system, your ERP, your WMS all have specific field requirements, naming conventions, and record types. We build the transformation layer to match your actual setup — not a lowest-common-denominator mapping that requires your team to work around it. This is the work that takes time but eliminates the manual reconciliation that eats ops hours for years.

Most common integration

Shopify + QuickBooks & Xero.

The Shopify–accounting integration is the most commonly requested and the most commonly broken. Here's what a properly built one looks like — and what the app store connectors miss.

What needs to sync

A complete Shopify–accounting integration moves more than just orders. It covers: order creation (mapped to the right income account by product category), sales tax collection (by jurisdiction, not just a single line), Shopify Payments payouts (net of fees, mapped to a clearing account), manual refunds and returns (as credit memos or negative invoices, depending on your workflow), gift card redemptions and issuances, and multi-currency transactions (converted at the transaction rate, not today's rate).

This is where app store connectors fail. Most handle simple order → invoice sync well. The moment you have Shopify Payments fee reconciliation, partial refunds, or custom tax treatments, the app creates incorrect records that your accountant has to manually fix every month.

The payout reconciliation problem

Shopify pays out in batches — orders from Monday through Thursday might hit your bank account the following Tuesday, net of Shopify's fees. This creates an accounting challenge: the order date, the payout date, and the fee deduction date are all different. Most connectors either ignore this entirely or handle it incorrectly, creating reconciliation nightmares at month-end.

A properly built integration uses a Shopify Payments clearing account: orders post to the clearing account on the order date, payouts move the net amount to your bank account on the payout date, and Shopify's fees post as an expense on the payout date. The result is a balance sheet that actually reconciles.

App vs. custom build

For most early-stage Shopify stores, a well-configured Xero or QuickBooks app (A2X is the best we've seen) handles the common cases adequately. We'll tell you honestly in a scoping call whether you need custom work. The triggers for custom development: complex tax treatment across multiple jurisdictions, multi-currency with specific conversion requirements, large volume (2,000+ orders/month where app processing time becomes a problem), or ERP integration that runs through the same accounting system. If you're inside those bounds, a properly configured app gets you 90% of the way there.

Common questions

What people ask us.

Integration engagements generate consistent questions. Here are the ones we hear most often.

01 Should I use an app store connector or custom-built? +

Start with the app. If it handles your use case, you don't need us. The signals that you've outgrown app connectors: your ops team is manually fixing records more than once a week, you've had data gaps or duplicates that the app couldn't explain, or the app's data model doesn't match a critical part of your workflow. When you hit those, the cost of the manual work usually justifies custom development within 6–12 months.

02 How long does an integration build take? +

A straightforward accounting integration (Shopify → QuickBooks or Xero) with custom field mapping and payout reconciliation: 3–5 weeks. A full ERP integration (NetSuite, Dynamics) with bi-directional sync, multi-warehouse routing, and reconciliation layer: 8–16 weeks. These timelines assume the external system has a documented API and your team can provide access credentials within the first week. Undocumented APIs or legacy systems with no API extend the timeline.

03 Who owns the integration after you build it? +

You own the code, the infrastructure, and the credentials — always. We build it and hand over full documentation and deployment instructions. Most clients keep us on a light maintenance retainer ($500–$1,500/month) to handle API changes, new field mappings, and monitoring. Some clients take it fully in-house with their engineering team. We'll tell you honestly whether your internal team can maintain it without us after a knowledge transfer.

04 What happens when the external API changes? +

Every integration we build includes an API version pin and a monitoring alert when the external API deprecates the version we're using. We deliver a dependency map and upgrade guide as part of the build documentation. The key principle: API changes are scheduled — deprecation notices are published months in advance. Integrations that break on API changes were built without version management. Ours don't, because we bake version handling in from day one.

05 Do you use Shopify Flow for integrations? +

Shopify Flow is excellent for Shopify-to-Shopify automation and simple conditional logic. For integrations with external systems, Flow's limits (no complex transformations, no persistent state, limited error handling) mean it's usually not the right tool. We use Flow where it genuinely fits — tagging orders, triggering internal notifications, automating discount logic — and build proper integration middleware where the problem requires it.

Ready to wire it together?

Built clean. Runs without babysitting.

Scope an integration → All services

Tell us what needs to talk to what — we'll scope it in 30 minutes and tell you honestly whether you need custom development or a well-configured app will do. No pitch. Same-day follow-up.