This attribute defines the mobile landing page URLs.
Use this attribute if your website also supports a mobile version and you want to provide links to your mobile-optimized landing page. By including the attribute link you can promote the user experience by decreasing the loading time of your website. You will then also get Merchant Center reports containing issues about your mobile-optimized landing pages.
Your URL must start with 'http://' or 'https://' and the name should be the same as in your Merchant Center account or in the Website Verification tab. In case you have any symbols in your URL use encoded entities. If you provide products in different variations use different URLs.
If you close your shop for a certain time period (e.g. during a vacation) or if you offer items that are currently out of stock you can specify this in the availability attribute with its value 'out of stock'.