API Google

Veja bem,
Você também está querendo usar as API's do Google? Em especial o GoogleMaps com Geocoding? Faça o seguinte
Acesse
https://code.google.com/apis/console 
Nesse endereço você consegue a Key, sem a qual você não consegue fazer nada.


Referência:

Obtaining an API Key

All Maps API applications* should load the Maps API using an API key. Using an API key enables you to monitor your application's Maps API usage, and ensures that Google can contact you about your application if necessary. If your application's Maps API usage by exceeds the Usage Limits, you must load the Maps API using an API key in order to purchase additional quota.

* Google Maps API for Business developers must not include a key in their requests. Please refer to Loading the Google Maps JavaScript API for Business-specific instructions.

To create your API key:

1. Visit the APIs Console at https://code.google.com/apis/console and log in with your Google Account.
2. Click the Services link from the left-hand menu.
3. Activate the Google Maps API v3 service.
4. Click the API Access link from the left-hand menu. Your API key is available from the API Access page, in the Simple API Access section. Maps API applications use the Key for browser apps.