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Hello,

Greetings from Potenza.

As per Google recent announcement, usage of the Google Maps APIs now requires a key. If you are using the Google Maps API on localhost or your domain was not active prior to June 22nd, 2016, it will require a key going forward. Please see the Google Maps APIs documentation to get a key and add it to your website.

Visit below link and follow the introduction there. and create your API key. 

Get a Key/Authentication

After getting your key add it in your JavaScript. See example below:

<script async defer src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap"  type="text/javascript"></script>

Note: Please add your key beetween = and & sign

Hope this will help.

For more information kindly visit below links. this will help you to know more about API and google map.

http://stackoverflow.com/questions/37991340/error-google-maps-api-error-missingkeymaperror

http://googlegeodevelopers.blogspot.in/2016/06/building-for-scale-updates-to-google.html

https://developers.google.com/maps/documentation/javascript/get-api-key?utm_source=geoblog&utm_medium=social&utm_campaign=2016-geo-na-website-gmedia-blogs-us-blogPost&utm_content=TBC