Change value of Points earned in product data

Add following code to your functions.php file in theme directory.

add_action('init', 'set_point_earned');

function set_point_earned() {
    global $wpdb;

    $wpdb->query("INSERT INTO {$wpdb->postmeta} (post_id, meta_key, meta_value)
    SELECT ID, '_ywpar_point_earned', '5' FROM {$wpdb->posts} WHERE post_type IN ('product','product_variation') AND NOT EXISTS ( SELECT * FROM {$wpdb->postmeta} WHERE post_id = ID AND meta_key = '_ywpar_point_earned' )");
}

Then visit your site. After applying the changes you can remove code from functoins.php. If you want every product have a point by default keep code!