Example get data as a plugin

get-data.php

<?php

/*
Plugin Name: Get Data
Plugin URI: http://URI_Of_Page_Describing_Plugin_and_Updates
Description: A brief description of the Plugin.
Version: 1.0
Author: alan
Author URI: http://URI_Of_The_Plugin_Author
License: A "Slug" license name e.g. GPL2
*/

add_action(
	'init',
	function () {
		if ( ! class_exists( '\WidgetForEventbriteAPI\Includes\Eventbrite_Query' ) ) {
			return;
		}
		add_shortcode(
			'wfea_get_data',
			'wfea_get_data'
		);
	}
);

function wfea_get_data() {
	$events      = new \WidgetForEventbriteAPI\Includes\Eventbrite_Query(
		array(
			'token'    => '',  //api key will default to settings if blank
			'limit'    => 1,
			'status'   => 'live',
			'nopaging' => true, // needed
		)
	);
	$json_pretty = json_encode( $events->api_results->events[0], JSON_PRETTY_PRINT );

	return '<pre>' . $json_pretty . '<pre/>';
}