ERP API PLATFORM

Build on a 100% Open ERP API

No Restrictions

No Extra Fees

Unlike legacy ERPs that charge $500-1000+/month for API access or restrict integrations, Fulfil gives Shopify Plus and DTC brands complete programmatic control. Every ERP function in the UI is available through our API no artificial restrictions, no per-call fees, no surprises.

Complete REST API coverage of all ERP functions

No API access fees or premium tiers required

1000+ calls/minute standard rate limits

Real-time webhooks for inventory, orders, and fulfillment

Request a Demo

Push Shopify order to ERP

POST /services/channels/v1/orders.json

{
  "channel_identifier": "SHOPIFY-1234",
  "confirmed_at": "2025-10-01T08:20:23",
  "status": "pending",
  "customer": {
    "name": "John Doe",
    "contacts": [["email", "john@example.com"]]
  },
  "lines": [{
    "sku": "PROD-001",
    "quantity": 2
  }]
}

# Response: Order created in ERP
{
  "id": 5042,
  "number": "SO-5042",
  "status": "confirmed"
}

Why Fulfil's ERP API vs Legacy ERP APIs

Built for modern DTC and Shopify Plus brands, not enterprise IT departments

Feature	Legacy ERPs	Fulfil ERP API
API Access Cost	$500-1000+/month for API access	✓ Included free with every plan
Rate Limits	Limited to 100-500 calls/minute	✓ 1000+ calls/minute standard
API Coverage	Restricted endpoints, missing functions	✓ 100% coverage - every UI function
Technology	Complex SOAP/XML from the 2000s	✓ Modern REST with JSON
Sandbox Setup	Weeks to provision environments	✓ Instant sandbox with every account
Documentation	Scattered docs, inconsistent examples	✓ Complete docs with working examples

Our ERP API powers everything from single Shopify stores to complex omnichannel operations with 10+ sales channels and multiple 3PLs.

Four APIs for every integration

Purpose-built APIs for eCommerce channels, 3PL operations, shipping carriers, and custom ERP extensions

Admin REST API

OAuth 2.0 • Personal Access Tokens

The primary API for building custom ERP applications. Full access to all Fulfil models and operations with comprehensive read/write capabilities. Perfect for building internal tools, custom dashboards, and headless Shopify integrations.

Complete ERP data model access

RESTful endpoints for all models

Advanced filtering and searching

Batch operations support

Channel Integration API

JWT Authentication

Built for custom sales channels and marketplaces not natively supported by Fulfil. Push orders to the ERP, sync inventory across channels, and update fulfillment status in real-time.

Push custom channel orders
Real-time inventory sync
Fulfillment updates
Returns handling

View documentation

3PL Integration API

JWT Authentication

Designed for third-party logistics providers. Each 3PL gets independent API access to manage their assigned warehouse operations and orders.

Pick, pack, ship orders
Receive inventory
Update stock levels
Returns processing

View documentation

Carrier Integration API

Carrier-dependent auth

Connect regional or international shipping carriers for better rates and delivery times in specific markets.

Rate shopping
Label generation
Tracking webhooks
Manifest creation

View documentation

Building ETL for Analytics? Use the Data Warehouse Instead

If you're considering the API to extract data for analytics or reporting, skip the API integration entirely. Fulfil includes a fully managed Google BigQuery data warehouse with zero setup, no API calls, no rate limits, and no ETL pipelines to build.

Automatic provisioning - ready from day one

Near real-time sync - updates multiple times per hour

AI Copilot - natural language to SQL

Google Sheets integration - no BI tool required

Connect any BI tool - Looker, Tableau, Power BI, Metabase

Zero impact on operations - queries run in BigQuery

Included with your Fulfil ERP. No extra cost for the data warehouse and no setup required. Your Shopify orders, Amazon inventory, 3PL shipments, and financials sync automatically. Daily query quota included sufficient for most analytics workloads.

Learn more about the Data Warehouse

REAL-TIME UPDATES

Webhooks for real-time ERP integrations

Stop polling the API. Fulfil sends instant webhook notifications when orders are created, inventory changes, shipments go out, or any ERP event occurs. Critical for keeping custom apps and external systems in sync with your ERP.

Order webhooks

Get notified when orders are created, confirmed, or cancelled in the ERP
Inventory webhooks

Real-time updates when stock levels change across warehouses
Fulfillment webhooks

Instant notification when 3PLs ship orders with tracking numbers
Custom event webhooks

Subscribe to any ERP model change for custom workflows

Large-scale operations: For high-volume integrations, Fulfil supports Google Pub/Sub as an alternative to HTTP-based webhooks, providing reliable message delivery with automatic retry and scaling.

Webhook payload

# Webhook sent when order ships
POST https://your-app.com/webhooks

{
  "event": "shipment.created",
  "data": {
    "order_number": "SO-5042",
    "tracking_number": "1Z999AA10123456",
    "carrier": "UPS",
    "shipped_at": "2025-10-01T14:30:00Z"
  }
}

# Your app updates Shopify
await shopify.fulfillments.create({
  tracking_number: "1Z999AA10123456"
})

Quick Start

Start building in 3 steps, 5 minutes

Get your ERP API credentials and make your first request in under 5 minutes. No complex setup, no infrastructure, no waiting for IT to provision access.

Generate API credentials (1 minute)

Log into Fulfil → User Preferences → Generate Personal Access Token. Copy the token.

Make your first ERP API request (2 minutes)

Use basic authentication with your token to fetch orders, inventory, or any ERP data. All responses return JSON.

Browse the API reference (2 minutes)

Explore endpoints for Shopify integration, 3PL management, inventory sync, and more with working code examples.

Step 2: First API call

# Fetch your ERP orders
curl -u YOUR_TOKEN: \
  https://merchant.fulfil.app/api/v2/model/sales_order

# Response (200 OK) - 2 seconds
{
  "data": [{
    "id": 5042,
    "number": "SO-5042",
    "channel": "Shopify",
    "total": "199.99"
  }],
  "count": 150
}

Create a purchase order

POST /api/v2/model/purchase_order

{
  "supplier": 4,
  "warehouse": 18,
  "lines": [{
    "product": 31,
    "quantity": 10,
    "unit_price": "3.00"
  }]
}

# Response (201 Created)
{
  "id": 892,
  "number": "PO-892",
  "state": "draft"
}

Real DTC use cases

See how Shopify Plus and omnichannel brands use Fulfil's APIs in production

🛒

Headless Shopify Plus Integration

Brands running headless Shopify Plus storefronts (React, Vue, Next.js) use Fulfil's ERP API to bypass Shopify's native inventory limitations. Push orders in real-time, sync inventory across unlimited locations, and manage fulfillment across multiple 3PLs all without Shopify's SKU or location constraints.

Channel Integration API • Admin REST API

Use case: Headless storefronts can bypass Shopify's native inventory and location limitations by connecting directly to Fulfil's ERP API.

🏭

Multi-3PL Orchestration

Growing DTC brands scaling from 1 warehouse to 5+ 3PLs use Fulfil's 3PL Integration API to give each logistics partner independent access. Each 3PL sees only their assigned inventory and orders, picks/packs/ships autonomously, and updates tracking all without your team coordinating manually.

3PL Integration API

Example: Home goods brand reduced fulfillment coordination time from 10 hours/week to zero by giving 4 regional 3PLs direct ERP API access.

🌐

Extend Beyond Native Integrations

While Shopify and Amazon connect natively, brands use the Channel Integration API to add proprietary B2B portals, regional marketplaces, or custom storefronts. Extend Fulfil's ERP beyond what's available out-of-the-box while maintaining unified inventory and order management across all channels.

Channel Integration API • Webhooks

Use case: Brands with native Shopify/Amazon integrations extend their ERP to custom B2B portals, regional marketplaces, and proprietary channels using the Channel Integration API.

🚚

Regional Carrier Integration

DTC brands shipping internationally use Fulfil's Carrier Integration API to connect regional carriers for better rates and delivery times in specific markets. Add support for Canada Post, Australia Post, Royal Mail, or any carrier with an API.

Carrier Integration API

Example: Apparel brand reduced UK shipping costs by 30% by integrating Royal Mail through Fulfil's Carrier API instead of using US carriers for international shipments.

📊

Custom Dashboards & BI Tools

Build internal dashboards, financial reports, and analytics tools tailored to your business. Extract ERP data for custom reporting, connect to Looker/Tableau, or build React dashboards for operations teams.

Admin REST API • Data Warehouse API

Example: DTC brand built a custom React dashboard showing real-time profitability by SKU, channel, and 3PL using Fulfil's Admin REST API.

💳

Custom Accounting & Financial Workflows

Connect proprietary payment processors, sync financial data with accounting systems, and build custom invoicing workflows. B2B brands use Fulfil's ERP API to generate custom invoices with net terms, volume discounts, and approval workflows that legacy ERPs can't handle.

Admin REST API

Example: B2B brand automated custom invoice generation with tiered pricing, net-60 terms, and automatic approval routing using Fulfil's API something their old ERP couldn't do.

Built for modern developers

Everything you need to build powerful ERP integrations and custom applications for DTC commerce

Comprehensive Docs

Complete ERP API reference with Shopify integration examples, authentication guides, and best practices for DTC brands.

RESTful & JSON

Standard REST principles with JSON payloads. No SOAP, no XML, no proprietary formats from legacy ERP systems.

Secure by Default

OAuth 2.0, personal access tokens, and granular ERP permissions. HTTPS everywhere, industry-standard security.

Advanced Filtering

Powerful query language for filtering, sorting, and searching across all ERP data models. Find exactly what you need.

Batch Operations

Create, update, or delete multiple ERP records in a single API call for better performance and efficiency.

Instant Sandbox

Every Fulfil ERP account includes a sandbox environment. Test integrations without affecting production data.

Developers building on Fulfil

Watch how developers have built custom applications on our platform

Developer Story

Zack Flynn

Developer

Developer Story

Stefan Vermaas

Developer

Developer Story

Dax Miller

Developer

Frequently asked questions

Which API should I use for my Shopify Plus integration?

Shopify Plus and Amazon are native integrations - you don't need an API or middleware. Fulfil connects directly to Shopify and Amazon using their official APIs. Simply authenticate your store in Fulfil's settings, and orders automatically sync to the ERP, inventory updates push to your storefront in real-time, and fulfillment/tracking data flows back to Shopify/Amazon automatically. No custom development required.

You only need the Channel Integration API if you're building a custom sales channel or marketplace that Fulfil doesn't natively support. Use the Admin REST API for headless commerce implementations or building custom internal tools. Use the 3PL Integration API if you're a logistics provider. Use the Carrier Integration API to add shipping carriers not natively supported.

Does Fulfil charge extra for API access like other ERPs?

No. Native integrations with Shopify, Amazon, and other major channels are included at no extra cost, with no API development or middleware fees. For custom API integrations, unlike legacy ERPs that charge $500-1000+/month for API access, Fulfil includes complete API access free with every plan. No premium tiers, no per-call fees, no surprises. This is critical for DTC brands that need to integrate custom channels, 3PLs, and proprietary systems without inflating their ERP costs.

How do I authenticate with the ERP API?

The Admin REST API supports OAuth 2.0 for public apps and personal access tokens for private integrations. Personal access tokens use HTTP Basic Authentication. The Channel Integration API and 3PL Integration API use JWT tokens. All requests must use HTTPS.

Are there rate limits on API requests?

Standard rate limit is 1000+ requests per minute far higher than most legacy ERPs that limit you to 100-500 calls/minute. For high-volume Shopify Plus brands or custom integrations with extreme API needs, contact our team to discuss your requirements and potential rate limit increases.

Can I test the ERP API before going live with my Shopify integration?

For native Shopify and Amazon integrations, you can test in Fulfil's sandbox environment without needing API development. Simply connect a test store and validate the integration works correctly. For custom API integrations, every Fulfil account includes an instant sandbox environment where you can test your integration without affecting production data. You can create test orders, inventory, and shipments to validate your implementation before going live.

What does "100% open API" actually mean?

Every function you see in Fulfil's UI is available through the API. If you can do it by clicking in the ERP, you can do it programmatically. No artificial restrictions, no "premium only" endpoints, no hidden features. This is different from legacy ERPs that restrict API access to drive consulting revenue.

Is there an SDK or client library for the ERP API?

The APIs are RESTful and work with any HTTP client. We provide code examples in cURL, Python, JavaScript, and other popular languages. The standard REST interface means you can use any HTTP library in your preferred programming language no proprietary SDKs required.

What support is available for API development?

For native Shopify and Amazon integrations, our support team can help with setup and troubleshooting no API development needed. For custom API integrations, complete documentation is available at docs.fulfil.io/developers. For technical support with custom channels, 3PL integrations, or API development, email our support team or create a support ticket.

Is there a Fulfil partnership program for developers?

Yes! If you're building Shopify apps, marketplace integrations, or tools for DTC brands on top of Fulfil's ERP API, we'd love to hear from you. Contact our partnerships team to discuss how your integration might benefit other customers.

Ready to start building on Fulfil's ERP API?

Explore our API documentation or talk to our team about your integration needs

Request a Demo

Operations

Financials

Platform

By Industry

Build on a 100% Open ERP API

Why Fulfil's ERP API vs Legacy ERP APIs

Four APIs for every integration

Admin REST API

Channel Integration API

3PL Integration API

Carrier Integration API

Building ETL for Analytics? Use the Data Warehouse Instead

Webhooks for real-time ERP integrations

Start building in 3 steps, 5 minutes

Generate API credentials (1 minute)

Make your first ERP API request (2 minutes)

Browse the API reference (2 minutes)

Real DTC use cases

Headless Shopify Plus Integration

Multi-3PL Orchestration

Extend Beyond Native Integrations

Regional Carrier Integration

Custom Dashboards & BI Tools

Custom Accounting & Financial Workflows

Built for modern developers

Comprehensive Docs

RESTful & JSON

Secure by Default

Advanced Filtering

Batch Operations

Instant Sandbox

Developers building on Fulfil

Zack Flynn

Stefan Vermaas

Dax Miller

Frequently asked questions

Ready to start building on Fulfil's ERP API?