The License Manager API allows the administrator to programmatically assign, unassign and re-assign Google Drive storage licenses to users.

Editions included: 
Google Apps for Business, Government and Education

Languages Supported:
All languages

For more information:
http://googleappsdeveloper.blogspot.com/2012/08/a-programmatic-way-to-managing-licenses.html
https://developers.google.com/google-apps/licensing/index

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