Google Address Autocomplete for WooCommerce

Test the autocomplete for these countries: Tonga, Samoa, Soloman Islands,Guam, Vanuatu, Fiji, Kiribas, Cook Islands, New Caledonia, Timor Leste

I sell into all of these countries from Australia.

Some will fail because they have neither States nor Postcodes.

You need a solution that inserts dummy data that is invisible in these fields until woocommerce itself gets more flexible when validating data entry. IOW it needs to know which countries can be fully validated and those which need partial validation.