Add up to ten domains separated by comas. If you leave this empty, Planyo will fill it out for you after the first time you use the plugin. You will only be able to use advanced integration on these domains and their subdomains (e.g. www.foo.com, reservations.foo.com, foo.com will all work if you enter foo.com). Examples: foo.com, bar.com.uk, foo.bar.com