[Refer A Friend] Programatically get a user's referral coupon/link

file.php

<?php

$user_id = 1;
$advocate = \AutomateWoo\Referrals\Advocate_Factory::get( $user_id );

// Retrieve or generate a shareable referral coupon (coupon sharing only)
$advocate->get_shareable_coupon();

// Retrieve or generate a shareable referral link (link sharing only)
$advocate->get_shareable_link();