N/certificateControl Module
Certificate.notifications
Property Description: The internal IDs of the employees copied on expiration notification email. The values for this property are found in the Copy Employees field of the Audience tab on the certificate record. When you create or edit a certificate object with values for this property, you also check the Copy Employees box for the certificate record.
Type: number []
Module: N/certificateControl Module
Parent Object: certificateControl.Certificate
Sibling Object Members: Certificate Object Members
Since: 2019.2
Search NetSuite - https://system.netsuite.com/app/help/helpcenter.nl?search=Certificate.notifications

// Code Example 1

// Add additional code

//...

//create a variable to hold the properties of the certificate object

var options = {

    name : 'testCertp12',

    description : 'testDescription',

    scriptId : '_testidp12',

    //include the internal IDs for employees you want copied on expiration reminder email

    notifications: [168,259]

    };

//create the certificate record with the options variable

var newCertificate = cc.createCertificate(options);

//save the certificate object

newCertificate.save();

//...

// Add additional code



//SOURCE: https://system.netsuite.com/app/help/helpcenter.nl?fid=section_156263222400.html