public function createBuyerAddress(array $buyer): string 	{ 		// array_filter to remove null values 		$zipCodeAndCity = implode(' ', array_filter([$buyer['zip_code'], $buyer['city']]));  		return implode( 			', ', 			array_filter([ 				$buyer['street'], 				$zipCodeAndCity, 				$buyer['country'], 			]) 		); 	}