protected function client(): SoapClient 	{ 		if (!$this->client) { 			$this->client = new SoapClient($this->wsdlUrl, [ 				'soap_version' => SOAP_1_2, 				'compression' => SOAP_COMPRESSION_ACCEPT | SOAP_COMPRESSION_DEFLATE, 				'cache_wsdl' => WSDL_CACHE_MEMORY, 				'ssl_method' => SOAP_SSL_METHOD_TLS, 				'features' => SOAP_SINGLE_ELEMENT_ARRAYS, 			]); 		}  		return $this->client; 	}