One Click Business Suite — Custom / other ecommerce API (free)
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Endpoint:
https://oneclicksuite.com.au/api/integrations/orders-webhook.php

Headers:
- Content-Type: application/json
- X-Orders-Token: <your saved token from Settings → Integrations>
- X-Orders-Provider: custom_store_name

Multi-brand:
- Add "brand_id" (integer) to the JSON body
- Use the ID from Settings → Organisation for each trading name
- If omitted, brand_id defaults to 1

Payload example:
{
  "brand_id": 2,
  "source": "custom",
  "source_order_id": "ABC-1001",
  "order_number": "1001",
  "customer_name": "Jane Citizen",
  "customer_email": "jane@example.com",
  "currency": "AUD",
  "subtotal": 100.00,
  "tax_total": 10.00,
  "shipping_total": 15.00,
  "total": 125.00,
  "status": "new",
  "order_date": "2026-03-16T10:00:00Z",
  "items": [
    {"sku":"SKU-1","product_name":"Item 1","qty":2,"unit_price":50,"line_total":100}
  ]
}

This guide is free to download. Create a One Click account, save your webhook token, then POST orders to the endpoint.