Configuration is confusing

[iadj]

I'm trying to configure this component in Yii2, but the following part confuses me:
Create file config.php for RESTAPI and config.php for Classic API every where:

I figured out we have to use the config-rest.php file from the project itself in the vendor folder. Normally you should always be able to set all parameters from within the base yii2 config file.

Can't we just define all parameters in the payPalRest component like so?

  'payPalRest'               => [
      'class'        => 'kun391\paypal\RestAPI',
      'pathFileConfig' =>  str_replace('\config', '', dirname(__FILE__)) . getenv('PAYPAL_CONFIG_PATH'),
      'successUrl' => '', //full url action return url
      'cancelUrl' => '' //full url action return url
      'endpoint'       => 'api.sandbox.paypal.com',
      'client_id'      => getenv('PAYPAL_CLIENT_ID'),
      'secret'         => getenv('PAYPAL_CLIENT_SECRET'),
      'business_owner' => getenv('PAYPAL_USERNAME'),
    'mode'                   => 'sandbox',
    'http.ConnectionTimeOut' => 60,
    'log.LogEnabled'         => false,
    'log.FileName'           => '@api/runtime/PayPal.log',
    'log.LogLevel'           => 'FINE',
  ],