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This guide walks you through making your first API calls to LinkXG. By the end, you will have working authentication and be able to retrieve product data.

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Prerequisites

Before you start, you need:
  • A LinkXG account with Owner or Admin role
  • A subscription tier that includes API access (Supplier Plus or higher for suppliers, Core or higher for buyers)
If you are on a free tier, you can still follow along using the application UI, but API access requires an upgrade.

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Step 1: Create an OAuth client

OAuth clients are how your integration authenticates with LinkXG.
  1. Log into LinkXG at app.linkxg.com
  2. Go to Account > API Access
  3. Select Create OAuth Client
  4. Enter a name (e.g., “My Integration”)
  5. Select the scopes you need:
    • products:read — to retrieve products
    • connections:read — to see your connections
  6. Select Create
You will see your client_id and client_secret. Copy the secret now — it is shown only once.

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Step 2: Get an access token

Exchange your credentials for an access token: 
curl -X POST https://api.linkxg.com/api/v1/oauth/token \
  -H "Content-Type: application/x-www-form-urlencoded" \
  -d "grant_type=client_credentials" \
  -d "client_id=YOUR_CLIENT_ID" \
  -d "client_secret=YOUR_CLIENT_SECRET" \
  -d "scope=products:read"
Response: 
{
  "access_token": "eyJhbGciOiJIUzI1NiIs...",
  "token_type": "Bearer",
  "expires_in": 900,
  "scope": "products:read"
}
Save the access_token. You will use it for all subsequent requests.

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Step 3: Make your first request

Retrieve your products: 
curl https://api.linkxg.com/api/v1/products \
  -H "Authorization: Bearer YOUR_ACCESS_TOKEN"
Response: 
{
  "success": true,
  "data": [
    {
      "id": "550e8400-e29b-41d4-a716-446655440000",
      "sku": "WIDGET-001",
      "name": "Industrial Widget",
      "category": "Components",
      "status": "ACTIVE",
      "createdAt": "2025-06-15T10:30:00Z",
      "updatedAt": "2025-12-01T14:22:00Z"
    }
  ],
  "pagination": {
    "page": 1,
    "pageSize": 20,
    "totalItems": 1,
    "totalPages": 1
  }
}

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Step 4: Retrieve a specific product

Get full details for a product: 
curl https://api.linkxg.com/api/v1/products/550e8400-e29b-41d4-a716-446655440000 \
  -H "Authorization: Bearer YOUR_ACCESS_TOKEN"
Response: 
{
  "success": true,
  "data": {
    "id": "550e8400-e29b-41d4-a716-446655440000",
    "sku": "WIDGET-001",
    "name": "Industrial Widget",
    "description": "High-precision industrial widget for manufacturing applications",
    "category": "Components",
    "status": "ACTIVE",
    "attributes": [
      {
        "family": "Specifications",
        "name": "Weight",
        "value": 2.5,
        "unit": "kg"
      },
      {
        "family": "Specifications",
        "name": "Material",
        "value": "Stainless Steel"
      }
    ],
    "certifications": [
      {
        "name": "ISO 9001",
        "validUntil": "2027-03-15"
      }
    ],
    "version": {
      "number": 3,
      "publishedAt": "2025-12-01T14:22:00Z"
    }
  }
}

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Common operations

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List products with pagination

curl "https://api.linkxg.com/api/v1/products?page=1&pageSize=50" \
  -H "Authorization: Bearer YOUR_ACCESS_TOKEN"

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Filter products by category

curl "https://api.linkxg.com/api/v1/products?category=Components" \
  -H "Authorization: Bearer YOUR_ACCESS_TOKEN"

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List your connections

curl https://api.linkxg.com/api/v1/connections \
  -H "Authorization: Bearer YOUR_ACCESS_TOKEN"

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View shared products from a supplier

curl "https://api.linkxg.com/api/v1/connections/CONNECTION_ID/products" \
  -H "Authorization: Bearer YOUR_ACCESS_TOKEN"

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Handling token expiry

Access tokens expire after 15 minutes. Before making requests, check if your token is about to expire and request a new one: 
let accessToken = null;
let tokenExpiresAt = 0;

async function getAccessToken() {
  // Refresh if token expires in less than 60 seconds
  if (Date.now() >= tokenExpiresAt - 60000) {
    const response = await fetch('https://api.linkxg.com/api/v1/oauth/token', {
      method: 'POST',
      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
      body: new URLSearchParams({
        grant_type: 'client_credentials',
        client_id: CLIENT_ID,
        client_secret: CLIENT_SECRET,
        scope: 'products:read'
      })
    });
    
    const data = await response.json();
    accessToken = data.access_token;
    tokenExpiresAt = Date.now() + (data.expires_in * 1000);
  }
  
  return accessToken;
}

async function apiRequest(endpoint) {
  const token = await getAccessToken();
  
  return fetch(`https://api.linkxg.com/api/v1${endpoint}`, {
    headers: { 'Authorization': `Bearer ${token}` }
  });
}

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What’s next

Now that you have working authentication, explore the full API:

API Reference

Complete endpoint documentation

Rate limits

Understand usage limits

Error handling

Handle errors gracefully

Authentication

Deep dive into auth options