How to get Google Maps, Places and Geo location API keys
Make a Google Project and enable APIs
1. Change application restrictions
Depending on your server/domain configuration the script maybe won't accept the HTTP referrers restrictions so try with changing the application restrictions back to None
2. Enable Billing on your project.
Sometimes after adding the key these features maybe won't work again. Then depending on the google account associated with the project created and maybe you will need to enable Billing.