I want to know whether it is possible or not? to get Google's 3 layer types in openlayers, nothing more.

 Just I came across a [web-page][1] about supplying private key from openlayers to google maps for business api. But checking on the Google Maps API page, it is asking for **signatures** which is hash of the query with a secret key for each request. I think it is for maps image requests also.which is contradicting with what the web-page says. 

Is anybody working with Gmap for business api with openlayer. How it can be done?
help is much appreciated.



  [1]: https://drupal.org/node/2151043