Fix WooCommerce Boleto ID with WooCommerce Sequential Order Numbers

fix-boleto.php

<?php
/**
 * Plugin Name: Fix WooCommerce Boleto ID with WooCommerce Sequential Order Numbers
 * Plugin URI: http://claudiosmweb.com/
 * Description: WooCommerce Boleto is a brazilian payment gateway for WooCommerce
 * Author: claudiosanches
 * Author URI: http://claudiosmweb.com/
 * Version: 0.1
 * License: GPLv2 or later
 */

/**
 * Fix WooCommerce Boleto ID with WooCommerce Sequential Order Numbers.
 *
 * @param  int $id Original ID.
 *
 * @return int     New ID.
 */
function fix_boleto_id( $id ) {

    return get_post_meta( $id, '_order_number', true );
}

add_filter( 'wcboleto_our_number', 'fix_boleto_id' );
add_filter( 'wcboleto_document_number', 'fix_boleto_id' );