10 Types of Ecommerce Integrations Explained

Every ecommerce brand sits at the center of a stack of tools: a storefront, a marketplace or two, a WMS, an ERP, a shipping platform, customer support. Integrations are how those tools talk to each other so orders, inventory, and customer data flow without anyone copying numbers between tabs.

What are ecommerce integrations?

Ecommerce integrations are the software connections that let two or more systems share data automatically. A Shopify-to-WMS integration pushes orders from the storefront into the warehouse system and pushes inventory and tracking numbers back. The brand never opens both apps to reconcile.

Three things make a good integration:

It runs in real time (or near it). Lag in either direction creates overselling and out-of-sync inventory.

It is bidirectional where it needs to be. Orders flow one way, inventory and tracking flow the other.

It handles edge cases — split shipments, partial fulfillment, returns, address changes — without manual cleanup.

Why do ecommerce integrations matter?

Without them, an operator is the integration. Someone exports a CSV from Shopify, uploads it to the WMS, exports tracking from the WMS, uploads it back to Shopify, and reconciles inventory manually at the end of the day. That works at low volume. It falls apart fast as orders climb.

Strong integrations:

Eliminate manual data entry and the errors that come with it.

Keep inventory accurate across every sales channel in real time.

Make it possible to add new channels (TikTok Shop, Walmart) without rebuilding workflows.

Reduce customer service overhead by exposing tracking and inventory data automatically.

What are the most common ecommerce integration types?

Most ecommerce stacks pull from the same set of integration categories:

1. Shopping cart and storefront integrations

Shopify, BigCommerce, WooCommerce, Magento. The brand's direct-to-consumer storefront pushes orders to the WMS and reads inventory levels back. This is usually the highest-volume integration in the stack.

2. Marketplace integrations

Amazon (Seller Central and FBM), Walmart Marketplace, eBay, Etsy, Target Plus. Each marketplace has its own API and labeling requirements. The integration handles both order intake and channel-specific outbound rules.

3. Order management system (OMS) integrations

An OMS sits between sales channels and fulfillment to consolidate orders, run routing rules, and split or combine shipments. Brands selling on multiple channels usually need one. The OMS integrates with both the storefronts and the WMS.

4. Warehouse management system (WMS) integrations

The WMS is the system of record for inventory, picking, packing, and shipping. Everything else integrates into the WMS so the warehouse sees one source of truth across every channel.

5. ERP integrations

NetSuite, SAP, Microsoft Dynamics, Sage. The ERP handles accounting, purchasing, and financial reporting. ERP-WMS integration matters when inventory has to reconcile with financials in real time.

6. CRM integrations

Salesforce, HubSpot, Klaviyo. Customer data flows into the marketing and sales tools so segmentation, support, and lifecycle campaigns reflect actual purchase history.

7. EDI integrations

Required by major retail wholesale accounts (Target, Costco, Walmart retail, Home Depot). EDI 850 (PO), 856 (ASN), 810 (invoice), and others tie the brand's system into the retailer's system. Compliance is non-negotiable for retail accounts.

8. POS integrations

Shopify POS, Square, Clover, Lightspeed. For brands with physical retail or pop-up presence, the POS shares inventory with the same pool that powers ecommerce.

9. Shipping and carrier integrations

Direct API connections to UPS, FedEx, USPS, DHL, and regional carriers. The WMS pulls live rates, generates labels, and reads tracking events back as they happen.

10. Accounting and tax integrations

QuickBooks, Xero, Avalara, TaxJar. Order data flows into accounting and sales tax systems so the brand does not reconcile receipts at month-end.

How do integrations actually get set up?

Three common paths:

Native connector. The WMS, OMS, or platform ships a pre-built integration. Plug it in, authenticate, configure rules. This is the lowest-effort path when it exists.

iPaaS middleware. Tools like Celigo, Workato, or Zapier sit between systems and translate data. Useful when no native connector exists and the brand wants flexibility.

Custom API build. Direct API-to-API integration written by a developer. Highest effort, most flexibility. Usually reserved for unique requirements or high-volume channels where native connectors fall short.

The right path depends on volume, complexity, and how much custom logic the brand needs in the data flow.

How 3PL Center handles ecommerce integrations

Integration depth is one of the things that separates a strong 3PL from a generic one. What we run for clients:

Direct integrations with Shopify, Amazon, Walmart, BigCommerce, and other major ecommerce platforms.

EDI for retail wholesale accounts (850, 856, 810, and partner-specific document sets).

Carrier integrations with UPS, FedEx, USPS, and regional carriers for live rates and label generation.

OMS-compatible workflows when the brand runs a separate order management layer.

Real-time inventory exposed through the portal, on-hand and in-transit visible at every step of the journey.

99.9% fulfillment accuracy across every channel we ship.