public static function installPromotionRuleTypes(Package $pkg)
{
Installer::installPromotionRuleType('subtotal_minimum', 'Subtotal Minimum', $pkg);
Installer::installPromotionRuleType('product_exists', 'Product X is in Cart', $pkg);
Installer::installPromotionRuleType('date_restriction', 'Date Limit', $pkg);
Installer::installPromotionRuleType('qty_in_cart', 'Number of Items in Cart', $pkg);
Installer::installPromotionRuleType('user_group', 'Specific User Group', $pkg);
}