OAuth credentials are how we access the address book APIs on your behalf. This is a one-time set up with each address book source and your CloudSponge account.
Before you can access Gmail address books, you’ll need to set up your Google OAuth credentials.
To optimize your user experience for Yahoo and Microsoft address books, you will need to register an application at each of the contact sources. Once registered, you will need to add these credentials to your CloudSponge account.
Microsoft’s OAuth is used for Outlook.com and Office 365 address books.