You can find your Google Merchant ID by following these steps:
Log in to Google Merchant Center
Go to Google Merchant Center and sign in with your account.
Locate Your Merchant ID
In the top-right corner of the Merchant Center dashboard, you'll see your Merchant ID displayed next to your account name.
Find It in Account Settings (Alternative Method)
Click the three-dot menu (⚙️) in the top-right corner.
Select Account settings > Business information.
Your Merchant ID will be listed under "Account details."
This ID is required for integrations with Google services like Free Product Listings and Shopping Ads.