Google Contacts
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Contacts API v3
The Google Contacts API allows client applications to view and update a user's contacts. Contacts are stored in the user's Google Account; most Google services have access to the contact list. Your client application can use the Google Contacts API to create new contacts, edit or delete existing contacts, and query for contacts that match particular criteria
Google Contact Sync 2.1 - Boru Wiki
From Boru Wiki Boru's Google-vTiger Contact Sync is designed to automatically synchronize your vTiger and Google Contacts. Users can decide which vTiger Contacts are sent to their Google Account and which Google Contacts are added to vTiger. Once a Contact is sent in either direction, all edits to the Contact will be mirrored to the other account.
Inviting friends is the most important part of the web project success. This post explains you how to import Gmail contacts from address book via Google open authorization protocol connect with PHP. It’s simple just few configurations follow below four steps, use this script and give option to invite more friends.
