To enable this ad extension, firstly you should enable the Free local product listings program in Google Merchant Center > Growth > Manage Programs. Click start and provide the necessary business information asked by google.The second step is to set up a local inventory feed. It is similar to your primary product feed, only difference is that you need to add a Store Code, Product ID, Quantity, and Price. Besides those required features, you can also send Sale Price, Sales Price Effective Date, Availability, and Pick-up Method. It is highly recommended that you send your inventory feeds daily.The third step then is to send the inventory verification request which also can be done from the Manage program > Free local product listings > Settings. Google will take around 7 days to verify your setup and activate the extension for you.The final step is to enable the local product setting in your shopping ads campaign. You can find this in your shopping ads campaign > settings > local products.