To get API key, please follow these instructions. Feel free to ask for help if you didn't success in it.
Please also note that to make the map work properly, you need to activate the following Google Maps APIs:
* Geocoding API
* Geolocation API
* Places API
* Maps Static API (required for PDF flyer)
To do it, please do the following:
1. Visit the APIs Console at https://code.google.com/apis/console and log in with your Google Account.
2. Select your project (your website) where Estatik is installed.
3. Go to Library APIs >> Maps.
4. Activate every API above one by one.