protected function _send_request( $url, $args = array() ) {
		$url = 'https://mailtrap.io/api/v1/inboxes/' . $this->config['inbox_id'] . $url;

		$args = wp_parse_args( $args, array(
			'method'  => 'GET',
			'headers' => array(),
		) );

		$args['headers'] = array_merge( $args['headers'], array(
			'Api-Token' => $this->config['api_token'],
			'Accept'    => 'application/json',
		) );

		$response = wp_remote_request( $url, $args );

		return $response;
	}