Curl best practice for API calls? Protecting sensitive data like API keys

Thank you: Here I read: https://www.codeigniter.com/user_guide/l...ng-options

"Since v4.4.0, the default value has been changed to false."

system/Config/Service.php

PHP Code:

    /**
    * The CURL Request class acts as a simple HTTP client for interacting
    * with other servers, typically through APIs.
    *
    * @return CURLRequest
    */
    public static function curlrequest(array $options = [], ?ResponseInterface $response = null, ?App $config = null, bool $getShared = true)
    {
        if ($getShared === true) {
            return static::getSharedInstance('curlrequest', $options, $response, $config);
        }

        $config ??= config(App::class);
        $response ??= new Response($config);

        return new CURLRequest(
            $config,
            new URI($options['base_uri'] ?? null),
            $response,
            $options
        );
    } 


So there is no need to specifically use single_service() in my libraries that use curl requests? The options for curl requests passed to the constructor are usually not shared?