Home - AI-Powered Shopping Ads - Your client is working with an agency to set up a product feed in Google Merchant Center, but the agency is not sure which attributes to include. Which attribute is optional? Your client is working with an agency to set up a product feed in Google Merchant Center, but the agency is not sure which attributes to include. Which attribute is optional? 2shares Facebook Twitter Pinterest LinkedIn Skype Facebook Messenger image_link availability product_type price