The map will show markers with links to open the property booking page for all properties for which latitude and longitude coordinates are set in {#fas:cog}} (SETTINGS) > PROPERTIES > DESCRIPTION.
Google Maps on your own domain can require an API key which you can obtain from Google and enter in in {{#fas:cog}} (SETTINGS) BOOKING ENGINE > MULTI BOOKING PAGE > DEVELOPERS.
Usually a free key is sufficient.but make sure you fulfil all of Google requirements which at the moment are: *Allowed access from your URL with the API Key (needs to be set in Google Cloud Platform)*Activate the "Maps JavaScript API" in Google (which is the one for embedding maps to websites)*Enabled billing in Google