What is the service name in ClientLogin for each Data API?
Service name is the name of the Google service for which authorization is requested. It is used in ClientLogin, and each Google service has its own service name. To obtain an authentication token in ClientLogin, submit an HTTP POST request to the following URL: https://www.google.com/accounts/ClientLogin List of Service Names Calendar Data APIcl Google Base Data APIgbase Blogger Data APIblogger Contacts Data APIcp Documents List Data APIwritely Picasa Web Albums Data APIlh2 Google Apps APIapps Spreadsheets Data APIwise YouTube Data APIyoutube For more information on the other parameters used in the ClientLogin POST, please see the ClientLogin documentation.