Google Merchant Center

Google Merchant Center

Access the Google Merchant Center API with managed OAuth authentication. Manage products, inventories, promotions, data sources, and reports for Google Shopping.

Quick Start

# List products in your Merchant Center account
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://api.maton.ai/google-merchant/products/v1/accounts/{accountId}/products')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Base URL

https://api.maton.ai/google-merchant/{sub-api}/{version}/accounts/{accountId}/{resource}

The Merchant API uses a modular sub-API structure:

• {sub-api} — the service module: products, accounts, datasources, reports, promotions, inventories, notifications, conversions
• {version} — currently v1
• {accountId} — your Merchant Center account ID

Maton proxies requests to merchantapi.googleapis.com and automatically injects your OAuth token.

Important: The v1 API requires one-time developer registration. See Developer Registration section.

Authentication

All requests require the Maton API key in the Authorization header:

Authorization: Bearer $MATON_API_KEY

IMPORTANT: Treat MATON_API_KEY as a secret — do not log it, include it in chats or prompts visible to others, or expose it in shared files or outputs. The key authenticates with Maton, and the Google Merchant connection is independently scoped via OAuth. Use least-privilege Google Merchant access, revoke the connection when no longer needed, and if the key is compromised, rotate it immediately at maton.ai/settings.

Environment Variable: Set your API key as MATON_API_KEY:

export MATON_API_KEY="YOUR_API_KEY"

Getting Your API Key

1. Sign in or create an account at maton.ai
2. Go to maton.ai/settings
3. Copy your API key

Finding Your Merchant Center Account ID

Your Merchant Center account ID is a numeric identifier. To find it:

1. Log in to Google Merchant Center
2. Look at the URL - it contains your account ID: https://merchants.google.com/mc/overview?a=ACCOUNT_ID

Developer Registration

Important: Before using the v1 API, you must complete a one-time developer registration to associate your account with the API.

Step 1: Get Your Account ID

Option A: Try fetching via API first

Try listing accounts using the v1beta endpoint. If this works, you can get your account ID automatically:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://api.maton.ai/google-merchant/accounts/v1beta/accounts')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
try:
    result = json.load(urllib.request.urlopen(req))
    for account in result.get('accounts', []):
        print(f"Account ID: {account['accountId']}, Name: {account['accountName']}")
except Exception as e:
    print(f"v1beta not available - use Option B to get your account ID manually")
EOF

Option B: From Merchant Center UI (if Option A fails)

If the v1beta endpoint is unavailable or returns an error:

1. Log in to Google Merchant Center
2. Your account ID is in the URL: https://merchants.google.com/mc/overview?a=YOUR_ACCOUNT_ID

For example, if your URL is https://merchants.google.com/mc/overview?a=123456789, your account ID is 123456789.

Step 2: Register for API Access

Call the registerGcp endpoint with your account ID and email:

python <<'EOF'
import urllib.request, os, json

account_id = 'YOUR_ACCOUNT_ID'  # From Step 1
developer_email = '[email protected]'  # Your Google account email

data = json.dumps({'developerEmail': developer_email}).encode()
req = urllib.request.Request(
    f'https://api.maton.ai/google-merchant/accounts/v1/accounts/{account_id}/developerRegistration:registerGcp',
    data=data,
    method='POST'
)
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')

result = json.load(urllib.request.urlopen(req))
print(json.dumps(result, indent=2))
EOF

Response:

{
  "name": "accounts/123456789/developerRegistration",
  "gcpIds": ["216141799266"]
}

Step 3: Verify Registration

After registration, v1 endpoints will work:

python <<'EOF'
import urllib.request, os, json
account_id = 'YOUR_ACCOUNT_ID'
req = urllib.request.Request(f'https://api.maton.ai/google-merchant/accounts/v1/accounts/{account_id}')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Note: Registration only needs to be done once per Merchant Center account. After registration, all v1 endpoints will work for that account.

Connection Management

Manage your Google Merchant OAuth connections at https://api.maton.ai.

List Connections

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://api.maton.ai/connections?app=google-merchant&status=ACTIVE')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Create Connection

python <<'EOF'
import urllib.request, os, json
data = json.dumps({'app': 'google-merchant'}).encode()
req = urllib.request.Request('https://api.maton.ai/connections', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Get Connection

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://api.maton.ai/connections/{connection_id}')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

{
  "connection": {
    "connection_id": "{connection_id}",
    "status": "ACTIVE",
    "creation_time": "2026-02-07T06:41:22.751289Z",
    "last_updated_time": "2026-02-07T06:42:29.411979Z",
    "url": "https://connect.maton.ai/?session_token=...",
    "app": "google-merchant",
    "metadata": {}
  }
}

Open the returned url in a browser to complete OAuth authorization.

Delete Connection

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://api.maton.ai/connections/{connection_id}', method='DELETE')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Specifying Connection

If you have multiple Google Merchant connections, specify which one to use with the Maton-Connection header:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://api.maton.ai/google-merchant/products/v1/accounts/123456/products')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Maton-Connection', '{connection_id}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Always include the Maton-Connection header to ensure requests go to the intended account, especially before any write operation. If you have multiple connections and omit this header, the gateway uses the default connection, which may not be the intended account.

Security & Permissions

• Access is scoped to products, inventories, data sources, promotions, account settings, conversions, and reports within the connected Google Merchant Center account. Only install if you need Merchant Center administration. Revoke unused connections promptly.
• Default to read-only operations. Always start by listing or retrieving resources to confirm identifiers before proposing any changes.
• All write operations require explicit user approval with specific identifiers. Before executing any POST, PATCH, or DELETE call:
  1. Retrieve and display the target resource (product title/ID, data source name, promotion ID) so the user can verify.
  2. Clearly describe the intended effect (e.g., "This will delete product 'Blue Widget' (ID: onlineenUS~SKU123) from your Merchant Center account").
  3. Wait for explicit user confirmation before proceeding.
• High-impact operations require extra caution. Modifying product listings, changing data source configurations, updating inventory, or altering account settings can affect live Google Shopping listings and business operations. These actions must include a summary of consequences and require confirmation.

API Reference

Sub-API Structure

The Merchant API is organized into sub-APIs:

Accounts

List Accounts

GET /google-merchant/accounts/v1/accounts

Returns all Merchant Center accounts accessible with your OAuth credentials. Use this to find your account ID.

Get Account

GET /google-merchant/accounts/v1/accounts/{accountId}

List Sub-accounts

GET /google-merchant/accounts/v1/accounts/{accountId}:listSubaccounts

Note: This endpoint only works for multi-client accounts (MCAs). Standard merchant accounts will receive a 403 error.

Get Business Info

GET /google-merchant/accounts/v1/accounts/{accountId}/businessInfo

Update Business Info

PATCH /google-merchant/accounts/v1/accounts/{accountId}/businessInfo?updateMask=customerService
Content-Type: application/json

{
  "customerService": {
    "email": "[email protected]"
  }
}

Get Homepage

GET /google-merchant/accounts/v1/accounts/{accountId}/homepage

Get Shipping Settings

GET /google-merchant/accounts/v1/accounts/{accountId}/shippingSettings

Insert Shipping Settings

POST /google-merchant/accounts/v1/accounts/{accountId}/shippingSettings:insert
Content-Type: application/json

{
  "services": [
    {
      "serviceName": "Standard Shipping",
      "deliveryCountries": ["US"],
      "currencyCode": "USD",
      "deliveryTime": {
        "minTransitDays": 3,
        "maxTransitDays": 7,
        "minHandlingDays": 0,
        "maxHandlingDays": 1
      },
      "rateGroups": [
        {
          "singleValue": {
            "flatRate": {
              "amountMicros": "0",
              "currencyCode": "USD"
            }
          }
        }
      ],
      "active": true
    }
  ]
}

List Users

GET /google-merchant/accounts/v1/accounts/{accountId}/users

Get User

GET /google-merchant/accounts/v1/accounts/{accountId}/users/{email}

List Programs

GET /google-merchant/accounts/v1/accounts/{accountId}/programs

List Regions

GET /google-merchant/accounts/v1/accounts/{accountId}/regions

List Account Issues

GET /google-merchant/accounts/v1/accounts/{accountId}/issues

List Online Return Policies

GET /google-merchant/accounts/v1/accounts/{accountId}/onlineReturnPolicies

Products

List Products

GET /google-merchant/products/v1/accounts/{accountId}/products

Query parameters:

• pageSize (integer): Maximum results per page
• pageToken (string): Pagination token

Get Product

GET /google-merchant/products/v1/accounts/{accountId}/products/{productId}

Product ID format: contentLanguage~feedLabel~offerId (e.g., en~US~sku123)

Insert Product Input

POST /google-merchant/products/v1/accounts/{accountId}/productInputs:insert?dataSource=accounts/{accountId}/dataSources/{dataSourceId}
Content-Type: application/json

{
  "offerId": "sku123",
  "contentLanguage": "en",
  "feedLabel": "US",
  "productAttributes": {
    "title": "Product Title",
    "description": "Product description",
    "link": "https://example.com/product",
    "imageLink": "https://example.com/image.jpg",
    "availability": "in_stock",
    "price": {
      "amountMicros": "19990000",
      "currencyCode": "USD"
    },
    "condition": "new"
  }
}

Note: Products can only be inserted into data sources with input: "API" type. Create an API data source first if needed.

Delete Product Input

DELETE /google-merchant/products/v1/accounts/{accountId}/productInputs/{productId}?dataSource=accounts/{accountId}/dataSources/{dataSourceId}

Inventories

List Local Inventories

GET /google-merchant/inventories/v1/accounts/{accountId}/products/{productId}/localInventories

Note: Local inventories are only available for products with LOCAL channel. Use a product ID like local~en~US~sku123.

Insert Local Inventory

POST /google-merchant/inventories/v1/accounts/{accountId}/products/{productId}/localInventories:insert
Content-Type: application/json

{
  "storeCode": "store123"
}

Note: The storeCode must be a valid store code configured in your Merchant Center account. Additional inventory attributes may be available - refer to the Google Merchant API Reference for the complete field list.

List Regional Inventories

GET /google-merchant/inventories/v1/accounts/{accountId}/products/{productId}/regionalInventories

Data Sources

List Data Sources

GET /google-merchant/datasources/v1/accounts/{accountId}/dataSources

Get Data Source

GET /google-merchant/datasources/v1/accounts/{accountId}/dataSources/{dataSourceId}

Create Data Source

POST /google-merchant/datasources/v1/accounts/{accountId}/dataSources
Content-Type: application/json

{
  "displayName": "API Data Source",
  "primaryProductDataSource": {
    "feedLabel": "US",
    "contentLanguage": "en"
  }
}

Response:

{
  "name": "accounts/123456/dataSources/789",
  "dataSourceId": "789",
  "displayName": "API Data Source",
  "primaryProductDataSource": {
    "feedLabel": "US",
    "contentLanguage": "en"
  },
  "input": "API"
}

Update Data Source

PATCH /google-merchant/datasources/v1/accounts/{accountId}/dataSources/{dataSourceId}?updateMask=displayName
Content-Type: application/json

{
  "displayName": "Updated Name"
}

Delete Data Source

DELETE /google-merchant/datasources/v1/accounts/{accountId}/dataSources/{dataSourceId}

Fetch Data Source (trigger immediate refresh)

POST /google-merchant/datasources/v1/accounts/{accountId}/dataSources/{dataSourceId}:fetch

Note: Fetch only works for data sources with FILE input type. API and UI data sources cannot be fetched.

Reports

Search Reports

POST /google-merchant/reports/v1/accounts/{accountId}/reports:search
Content-Type: application/json

{
  "query": "SELECT offer_id, title, clicks, impressions FROM product_performance_view WHERE date BETWEEN '2026-01-01' AND '2026-01-31'"
}

Example: Query product_view (requires id field):

{
  "query": "SELECT id, offer_id, title, item_issues FROM product_view LIMIT 10"
}

Note: The product_view table requires the id field in the SELECT clause.

Available report tables:

• product_performance_view - Clicks, impressions, CTR by product
• product_view - Current inventory with attributes and issues (requires id in SELECT)
• price_competitiveness_product_view - Pricing vs competitors (requires Market Insights)
• price_insights_product_view - Suggested pricing
• best_sellers_product_cluster_view - Best sellers by category (requires Market Insights)
• competitive_visibility_competitor_view - Competitor visibility

Promotions

Note: Promotions require your Merchant Center account to be enrolled in the Promotions program. You'll receive a 403 error if not enrolled.

List Promotions

GET /google-merchant/promotions/v1/accounts/{accountId}/promotions

Get Promotion

GET /google-merchant/promotions/v1/accounts/{accountId}/promotions/{promotionId}

Insert Promotion

POST /google-merchant/promotions/v1/accounts/{accountId}/promotions:insert
Content-Type: application/json

{
  "promotionId": "promo123",
  "contentLanguage": "en",
  "targetCountry": "US",
  "redemptionChannel": ["ONLINE"],
  "attributes": {
    "longTitle": "20% off all products",
    "promotionEffectiveDates": "2026-02-01T00:00:00Z/2026-02-28T23:59:59Z"
  }
}

Notifications

List Notification Subscriptions

GET /google-merchant/notifications/v1/accounts/{accountId}/notificationsubscriptions

Create Notification Subscription

POST /google-merchant/notifications/v1/accounts/{accountId}/notificationsubscriptions
Content-Type: application/json

{
  "registeredEvent": "PRODUCT_STATUS_CHANGE",
  "callBackUri": "https://example.com/webhook",
  "allManagedAccounts": true
}

Note: You must specify either allManagedAccounts: true OR targetAccount: "accounts/{accountId}" to indicate which accounts the subscription applies to.

Alternative with targetAccount:

{
  "registeredEvent": "PRODUCT_STATUS_CHANGE",
  "callBackUri": "https://example.com/webhook",
  "targetAccount": "accounts/123456789"
}

Delete Notification Subscription

DELETE /google-merchant/notifications/v1/accounts/{accountId}/notificationsubscriptions/{subscriptionId}

Conversion Sources

List Conversion Sources

GET /google-merchant/conversions/v1/accounts/{accountId}/conversionSources

Create Conversion Source

POST /google-merchant/conversions/v1/accounts/{accountId}/conversionSources
Content-Type: application/json

{
  "merchantCenterDestination": {
    "displayName": "My Conversion Source",
    "destination": "SHOPPING_ADS",
    "currencyCode": "USD",
    "attributionSettings": {
      "attributionLookbackWindowDays": 30,
      "attributionModel": "CROSS_CHANNEL_LAST_CLICK"
    }
  }
}

Delete Conversion Source

DELETE /google-merchant/conversions/v1/accounts/{accountId}/conversionSources/{conversionSourceId}

Pagination

The API uses token-based pagination:

GET /google-merchant/products/v1/accounts/{accountId}/products?pageSize=50

Response includes nextPageToken when more results exist:

{
  "products": [...],
  "nextPageToken": "CAE..."
}

Use the token for the next page:

GET /google-merchant/products/v1/accounts/{accountId}/products?pageSize=50&pageToken=CAE...

Code Examples

JavaScript

const accountId = '123456789';
const response = await fetch(
  `https://api.maton.ai/google-merchant/products/v1/accounts/${accountId}/products`,
  {
    headers: {
      'Authorization': `Bearer ${process.env.MATON_API_KEY}`
    }
  }
);
const data = await response.json();

Python

import os
import requests

account_id = '123456789'
response = requests.get(
    f'https://api.maton.ai/google-merchant/products/v1/accounts/{account_id}/products',
    headers={'Authorization': f'Bearer {os.environ["MATON_API_KEY"]}'}
)
data = response.json()

Notes

• Developer registration required - You must complete Developer Registration once per Merchant Center account before using v1 endpoints
• Product IDs use the format contentLanguage~feedLabel~offerId (e.g., en~US~sku123)
• Products can only be inserted/updated/deleted in data sources with input: "API" type
• After inserting/updating a product, it may take several minutes before the processed product appears
• Monetary values use micros (divide by 1,000,000 for actual value)
• Local inventories only work for products with LOCAL channel (not ONLINE)
• The Promotions API requires your account to be enrolled in the Promotions program
• List Sub-accounts only works for multi-client accounts (MCAs)
• IMPORTANT: When using curl commands, use curl -g when URLs contain brackets to disable glob parsing
• IMPORTANT: When piping curl output to jq or other commands, environment variables like $MATON_API_KEY may not expand correctly in some shell environments

Error Handling

Common Errors

"GCP project is not registered": You need to complete developer registration. See Developer Registration section.

"The caller does not have access to the accounts": The specified account ID is not accessible with your OAuth credentials. Verify you have access to the Merchant Center account.

"Promotion program not enabled": Your Merchant Center account is not enrolled in the Promotions program. Enable it in Merchant Center settings.

"This method can only be accessed by multi-client accounts": You're calling an endpoint (like listSubaccounts) that only works for multi-client accounts (MCAs).

"Mismatched channel": You're trying to access local inventories for an ONLINE product. Local inventories only work with LOCAL channel products.

Troubleshooting: API Key Issues

1. Check that the MATON_API_KEY environment variable is set:

echo $MATON_API_KEY

1. Verify the API key is valid by listing connections:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://api.maton.ai/connections')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Troubleshooting: Invalid App Name

Ensure your URL path starts with google-merchant. For example:

• Correct: https://api.maton.ai/google-merchant/products/v1/accounts/{accountId}/products
• Incorrect: https://api.maton.ai/products/v1/accounts/{accountId}/products

Troubleshooting: 401 GCP Project Not Registered

If you see an error like "GCP project is not registered with the merchant account":

1. Complete developer registration - See Developer Registration section
2. Get your account ID from Merchant Center UI (in the URL after ?a=)
3. Call the registerGcp endpoint with your account ID and email
4. After successful registration, retry your original request

Resources

• Merchant API Overview
• Merchant API Reference
• Products Guide
• Data Sources Guide
• Reports Guide
• Product Data Specification
• Maton Community
• Maton Support