// UltraCart REST API · v2

Build commerce with the UltraCart API.

Items, orders, checkout, customers, and webhooks. One REST API with SDKs in six languages, so your first call takes minutes.

Start the quickstart →Browse the API reference

create-order.shcURLNodePHP

# Create an order with the REST API
curl -X POST https://secure.ultracart.com/rest/v2/order/orders \
  -H "Authorization: Bearer $UC_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "items": [{ "merchant_item_id": "TSHIRT-BLK-M", "quantity": 2 }] }'

# → 201 Created
{ "order": { "order_id": "DEMO-100148",
         "current_stage": "Accounts Receivable" } }

// START HERE

What are you building?

Pick your integration pattern. Each path leads into the same unified API reference.

Custom Storefront & Templates

Velocity, the StoreFront Object Model, and theme development.

Start building

Order & Fulfillment Sync

Connect ERP, 3PL, shipping, and EDI to keep orders in sync.

Start building

Marketing & Loyalty Automations

React to affiliate, rewards, and coupon events with webhooks.

Start building

Marketplace & Partner Apps

Build on the channel-partner API and multi-account access.

Start building

CRM & Customer Data Sync

Pipe customer and order data into your own systems.

Start building

// ESSENTIALS

The foundations, written once

Everything every integration needs. Learn it here, link to it everywhere.

AuthenticationAPI keys & OAuth

Sandbox & testingSafe test data

Rate limitsQuotas & backoff

WebhooksEvents & signatures

Versioningv2 & change policy

One unified API reference

Every endpoint in one place, generated from the OpenAPI spec. Guides link straight to the resources they use.

GET /item/items POST /order/orders GET /customer/customers POST /checkout/cart GET /auto_order POST /webhook

SDKs & samples

Official SDKs in six languages, plus a downloadable OpenAPI spec.

Java PHP C#Ruby Python Node.js

verify-webhook.js

import { UltraCartApi } from '@ultracart/rest-api-v2';

// Verify a webhook signature
const ok = api.verifySignature(req.body,
  req.headers['x-uc-webhook-signature']);

// NOT A DEVELOPER?

Running a store on UltraCart?

The merchant guides cover setup, catalog, checkout, orders, and marketing.

← Merchant docs