One Contacts API. Every Provider.

import Nylas from 'nylas';
Nylas.config({
    clientId: CLIENT_ID,
    clientSecret: CLIENT_SECRET
});
var nylas =  
    Nylas.with(ACCESS_TOKEN);
nylas.contacts
    .count()
    .then(count => {
        console.log(
            `You have ${count} contacts.`
        );
    });

require 'nylas'
nylas = Nylas::API.new(
    app_id: CLIENT_ID,
    app_secret: CLIENT_SECRET,
    access_token: ACCESS_TOKEN
)
contacts = 
    nylas.contacts.where(
        email: "[email protected]"
    )
contacts.each do |contact|
    puts contact.birthday
end

public class Contacts { 
  public static void main (String[] args) throws Exception {
    NylasAccount account = new NylasClient().account(ACCESS_TOKEN);
    List contacts = account.contacts().list();
    contacts.stream().forEach(( Contact contact ) -> {
      System.out.println( event.getEmails() ); 
    });
  }
}