Google Map Server Key is for getting Google Places detail in JSON format.

Follow below steps to create Google Server Key,

1. Go to Google API Console Page, https://console.developers.google.com

2. Create or Select Project.

3. Enable Google Maps Geocoding API in Library page.

4. On the Credentials page, get an API key (and set the API key restrictions).
Note: If you have an existing unrestricted API key, or a key with browser restrictions, you may use that key.