Understandting requests from GD to google maps

Hi

First, wishing the GD team a fantastic 2020, and thanks for the brilliant support provided in 2019.

I am currently trying to get a grip on request to google maps api so i can understand billing.

As i understand, if i have a map on the listing detail page, then each page load will be request for the dynamic map (which is currently $7/1000).
So I had the following queries – i suppose these will be relevant for most of your users too:

1. Have a static map ($2/1000) on page load, and load the dynamic map on some user click only – so it is not charged for all users but only those clicking on map – is this feasible?
2. If the map is in a tab/accordion will it still be loaded each page load, or only when tab is opened? – any other suggestion to load the dynamic map only for selected users?
3. Maps on mobile are currently free – is that only for mobile apps or also for website on mobile browser?
4. When is the geocoding api request made? when the user geolocation is done e.g. Near me?
5. Direction API would be triggered only when the user clicks on get directions below the map?

Also, I had tried to restrict application in the API to particular website, as google recommends to avoid misuses, but that stops the map working- is there an issue with using that?

Of course right now my traffic is very very small and well within the credits but it would be useful to understand this

thanks,
Vivek