The Google Custom Search .NET library by Google interacts with the search and customization functionalities of the API. It contains guides to setup with authentication and authorization, simple API example, web applications, and service accounts. Besides this .NET library can access custom search, additional APIs can be also supported with their respective documentation. A complete list: https://developers.google.com/api-client-library/dotnet/apis/
Discover has just become the first major credit card issuer to use the new Google "Save to Wallet" API for Payment Cards. Cardholders now have the ability to save cards to Google Wallet via the Discover account member benefits center.