public function export_data( $params = null ) {

		$defaults = array(
			'fields' => null,
			'depth'  => 2,
			'params' => null,
		);

		if ( empty( $params ) ) {
			$params = $defaults;
		} else {
			$params = array_merge( $defaults, (array) $params );
		}

		return $this->api->export( $this, $params );
	}