Paypal Sandbox API Test

I have created a test API on Paypal

Do you know what i have to put in this function to make it work ?

  // Creates a configuration array containing credentials and other required configuration parameters.  public static function getAcctAndConfig()  {    $config = array(        // Signature Credential"acct1.UserName" => "","acct1.Password" => "","acct1.Signature" => "",        // Subject is optional and is required only in case of third party authorization        //"acct1.Subject" => "",                // Sample Certificate Credential        // "acct1.UserName" => "certuser_biz_api1.paypal.com",        // "acct1.Password" => "D6JNKKULHN3G5B8A",        // Certificate path relative to config folder or absolute path in file system        // "acct1.CertPath" => "cert_key.pem",        // "acct1.AppId" => "APP-80W284485P519543T"        );    return array_merge($config, self::getConfig());;  }

Thanks for your help...