woocommerce/shortcodes/shortcode-order_tracking.php

<?php
/**
 * Order Tracking Shortcode
 *
 * Lets a user see the status of an order by entering their order details.
 *
 * @author 		WooThemes
 * @category 	Shortcodes
 * @package 	WooCommerce/Shortcodes/Order Tracking
 * @version     1.6.4
 */

/**
 * Get the order tracking shortcode content.
 *
 * @access public
 * @param array $atts
 * @return string
 */
function get_woocommerce_order_tracking( $atts ) {
	global $woocommerce;
	return $woocommerce->shortcode_wrapper('woocommerce_order_tracking', $atts);
}

/**
 * Output the order tracking shortcode.
 *
 * @access public
 * @param array $atts
 * @return void
 */
function woocommerce_order_tracking( $atts ) {
	global $woocommerce;

	$woocommerce->nocache();

	extract(shortcode_atts(array(
	), $atts));

	global $post;

	if ( ! empty( $_REQUEST['orderid'] ) ) {

		$woocommerce->verify_nonce( 'order_tracking' );

		$order_id 		= empty( $_REQUEST['orderid'] ) ? 0 : esc_attr( $_REQUEST['orderid'] );
		$order_email	= empty( $_REQUEST['order_email'] ) ? '' : esc_attr( $_REQUEST['order_email']) ;

		if ( ! $order_id ) {

			echo '<p class="woocommerce_error">' . __( 'Please enter a valid order ID', 'woocommerce' ) . '</p>';

		} elseif ( ! $order_email ) {

			echo '<p class="woocommerce_error">' . __( 'Please enter a valid order email', 'woocommerce' ) . '</p>';

		} else {

			$order = new WC_Order( apply_filters( 'woocommerce_shortcode_order_tracking_order_id', $order_id ) );

			if ( $order->id && $order_email ) {

				if ( strtolower( $order->billing_email ) == strtolower( $order_email ) ) {
					do_action( 'woocommerce_track_order', $order->id );
					woocommerce_get_template( 'order/tracking.php', array(
						'order' => $order
					) );

					return;
				}

			} else {

				echo '<p class="woocommerce_error">' . sprintf( __( 'Sorry, we could not find that order id in our database.', 'woocommerce' ), get_permalink($post->ID ) ) . '</p>';

			}

		}

	}

	woocommerce_get_template( 'order/form-tracking.php' );
}