Chilexpress shipping method, calculated per city.

chilexpress-shipping-method.php

<?php 

/**
 * Check if WooCommerce is active
 */
$active_plugins = apply_filters( 'active_plugins', get_option( 'active_plugins' ) );
if ( in_array( 'woocommerce/woocommerce.php', $active_plugins) ) {

 add_filter( 'woocommerce_shipping_methods', 'add_chilexpress_shipping_method' );
 function add_chilexpress_shipping_method( $methods ) {
   $methods[] = 'WC_Chilexpress_Shipping_Method';
   return $methods;
 }

 add_action( 'woocommerce_shipping_init', 'chilexpress_shipping_method_init' );
 function chilexpress_shipping_method_init(){
   require_once 'class-chilexpress-shipping-method.php';   
 }

}