<link rel="alternate" hreflang="x-default" href="{{ canonical_url | replace: shop.domain, 'example.com' }}" />
<link rel="alternate" href="{{ canonical_url | replace: shop.domain, 'us.example.com' }}" hreflang="en-us" />
<link rel="alternate" href="{{ canonical_url | replace: shop.domain, 'example.com' }}" hreflang="en-au" />