I today decided to correct the mistakes. Loaded the Google Map plugin into the Osclass panel. then I re-registered and confirmed the card, after I received the key.
after all I went to the page - Welcome to the API library.
I chose from the list - Maps JavaScript API.
Added restriction on HTTP referral sources.
copied key and added javascript library to Google Maps.
load / unload.
after, I updated the page, the map appeared and disappeared, I tried on different browsers, from the phone, tablet.
In general, you have to help me. I am your client, when I bought the topic I expected that there would be no problems with the Google card.