public function getAddedDiscounts(): ?string 	{ 		if ($this->discounts_applied) { 			$text = '<ul>';  			foreach ($this->discounts_applied as $index => $discount) { 				$text .= '<li>' . $discount['discount_name'] . '</li>'; 			} 			$text .= '</ul>';  			return $text; 		}  		return null; 	}