"For 'out of stock' items, the 'Buy' button must be greyed out on your product landing page. Make sure availability matches your product data."
"If a product is out of stock on your landing page, then update the availability attribute in your product data to match."
"Hiding the button is not allowed. Leaving it fully clickable is not allowed. What you need to do now is disable the button."
Google Merchant Center requires that for out of stock products, the buy button on the landing page must be grayed out. This ensures that product availability matches the data provided. If a product is out of stock, the availability attribute should be updated accordingly to prevent users from attempting to purchase unavailable items. Emmanuel Flossie emphasized that the button should be disabled, not hidden or left fully clickable.
Read at Search Engine Roundtable
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