> ## Documentation Index
> Fetch the complete documentation index at: https://docs.siftly.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Google Merchant Center

> Connect Google Merchant Center (GMC) to sync your product feed into Siftly Shopping and push optimized product data back to Google.

<Frame>
  <img src="https://mintcdn.com/siftly/xTchJceN5jI8__Fi/images/shopping/integration-gmc.png?fit=max&auto=format&n=xTchJceN5jI8__Fi&q=85&s=d0e82c3211daf611816ebb8a8844ce92" alt="Siftly Shopping connected to Google Merchant Center: product feed in, optimized attributes out" className="rounded-xl" width="1004" height="622" data-path="images/shopping/integration-gmc.png" />
</Frame>

## Overview

**Google Merchant Center (GMC)** is your product feed for Google's shopping surfaces. Connecting it lets Siftly Shopping read your feed for analysis and push **optimized product attributes** back to Google.

**Difficulty:** ✅ Easy. Connect with secure Google OAuth, then pick your Merchant Center account.

<Note>
  Google Merchant Center (GMC) is for your product feed. It is different from **Google Manufacturer Center (GMfC)**, which is for brand-owned manufacturer attributes. Many brands connect both. See [Google Manufacturer Center](/shopping/integrations/google-manufacturer-center).
</Note>

***

## Prerequisites

* A Google Merchant Center account with at least one product feed
* A Google user with access to that Merchant Center account

***

## Connecting

<Steps>
  <Step title="Start the connection">
    Go to **Settings → Integrations** and click **Connect** next to **Google Merchant Center**. You'll be redirected to Google to authorize access.
  </Step>

  <Step title="Authorize with Google">
    Sign in with the Google account that manages your Merchant Center and approve the requested access. Google redirects you back to Siftly.
  </Step>

  <Step title="Choose your Merchant Center account">
    Siftly shows the Merchant Center accounts you can access. Select the one you want to connect.
  </Step>

  <Step title="Your products sync">
    Siftly imports your product feed in the background and links it to your tracked catalog.
  </Step>
</Steps>

***

## What Siftly imports

Once connected, Siftly reads your GMC product feed (titles, descriptions, attributes, and identifiers) and uses it to enrich your tracked products and to power [Product Optimization](/shopping/content/product-optimization).

You can re-sync at any time from the GMC card in **Settings → Integrations**.

***

## Pushing optimized data back to Google

GMC is also a **publish destination**. When you run [Product Optimization](/shopping/content/product-optimization), Siftly writes your optimized attributes to Google through a supplemental data source: a separate feed that layers your improvements on top of your primary feed without overwriting it.

<Tip>
  Using a supplemental data source means your original feed stays intact. You can review what Siftly proposes before it's submitted, and roll back from the optimization job's version history.
</Tip>

***

## Reconnecting and disconnecting

* **Reconnect**: If access expires or permissions change, the GMC card shows a reconnect prompt. Click **Reconnect** and re-authorize with Google.
* **Disconnect**: Go to **Settings → Integrations → Google Merchant Center** and click **Disconnect**. This removes stored credentials; it does not delete data already in your Merchant Center.

***

## Troubleshooting

<AccordionGroup>
  <Accordion title="No Merchant Center accounts appear after authorizing">
    The Google account you used may not have access to a Merchant Center account. Sign in with an account that manages your GMC, or have an admin grant you access, then reconnect.
  </Accordion>

  <Accordion title="Products aren't syncing">
    Confirm your Merchant Center has an active product feed. Re-sync from the GMC card; large feeds can take a few minutes.
  </Accordion>

  <Accordion title="Optimized attributes aren't showing in Google">
    Supplemental data sources can take time to process on Google's side. Check the optimization job's status and your Merchant Center's feed processing.
  </Accordion>
</AccordionGroup>

***

## Related

<CardGroup cols={2}>
  <Card title="Google Manufacturer Center" icon="google" href="/shopping/integrations/google-manufacturer-center">
    Publish brand-owned manufacturer attributes.
  </Card>

  <Card title="Product Optimization" icon="wand-magic-sparkles" href="/shopping/content/product-optimization">
    Optimize product data and submit it to GMC.
  </Card>

  <Card title="Integrations overview" icon="plug" href="/shopping/integrations/overview">
    Compare every integration and what each one powers.
  </Card>

  <Card title="Products & readiness" icon="tags" href="/shopping/analytics/products">
    See how ready each product is to win in AI shopping.
  </Card>
</CardGroup>