Add product variations

functions.php

<?php

add_action('gens_after_generate_user_coupon', 'add_product_ids_to_raf_coupon', 10, 4);

function add_product_ids_to_raf_coupon($user_id, $type, $order, $coupon_id) {
    // Logic to determine which variation IDs to add
    $variation_ids = array(123, 456, 789); // Replace with your actual variation IDs

    // Get existing product IDs
    $existing_ids = get_post_meta($coupon_id, 'product_ids', true);
    
    // If existing IDs are not empty, convert to array
    if (!empty($existing_ids)) {
        $existing_ids = explode(',', $existing_ids);
    } else {
        $existing_ids = array();
    }

    // Merge existing IDs with new variation IDs
    $all_ids = array_unique(array_merge($existing_ids, $variation_ids));

    // Update the coupon with the new product IDs
    update_post_meta($coupon_id, 'product_ids', implode(',', $all_ids));
}