WooCoommerce - Modify [woocommerce_order_tracking] shortcode to search by custom order ID instead of the default post ID Raw

functions.php

<?php
// function 'get_post_id_by_meta_key_and_value' found at https://gist.github.com/feedmeastraycat/3065969
function get_post_id_by_meta_key_and_value( $key, $value ) {
	global $wpdb;
	$meta = $wpdb->get_results("SELECT * FROM `".$wpdb->postmeta."` WHERE meta_key='".$wpdb->escape($key)."' AND meta_value='".$wpdb->escape($value)."'");
	if (is_array( $meta ) && !empty( $meta ) && isset( $meta[0]) ) {
		$meta = $meta[0];
	}		
	if ( is_object( $meta ) ) {
		return $meta->post_id;
	}
	else {
		return false;
	}
}
add_filter( 'woocommerce_shortcode_order_tracking_order_id', 'search_by_invoice_order_number' );
function search_by_invoice_order_number( $order_id ) {
	$order_id = get_post_id_by_meta_key_and_value( '_wcpdf_invoice_number', $order_id );
	return $order_id;
}