public function getPaymentMethodName(): ?string 	{ 		switch ($this->payment_type) { 			case self::PAYMENT_METHOD_CARD: return 'CARD';  			case self::PAYMENT_METHOD_POUZECE: return 'POUZECE';  			case self::PAYMENT_METHOD_VIRMAN: return 'VIRMAN';  			case self::PAYMENT_METHOD_GIFT_CODE: return 'GIFT CODE'; 		}  		return null; 	}