Please go to iHealth App registration page, http://developer.ihealthlabs.com/developerappaddpage.htm create an application, and in the line 22 set the client_id to Client ID and client_secret with Client secret. The Callback URL must be https://erp.leaf.com.my/webmail/modules/OAuthIntegratorWebclient/Classes/OAuthClient/login_with_ihealth.php