user id integration from zoho to wp or shopping cart script

hi,

How to send a user id from zoho crm to wordpess sessions , the aim of it is sending back this user-id to google analytics servers to report cross devices conversions ?

- Case : http://cutroni.com/blog/2014/04/10/understanding-cross-device-measurement-and-the-user-id/

- Implementation code : https://developers.google.com/analytics/devguides/collection/analyticsjs/user-id#implementation

Tks..