update checkout fee

wp-content/plugins/woo-additional-fees-on-checkout-wordpress/classes/wps-ext-cst-frontend.php

@@ -5,7 +5,7 @@ class WPS_EXT_CST_Frontend
 	{
 		$ext_cst_status 	 = (get_option('ext_cst_status')) ? get_option('ext_cst_status') : 'enable';
 		if($ext_cst_status == 'enable' && !is_admin()){
-			add_action( 'woocommerce_after_order_notes', array($this,'add_option_to_checkout' ));
+			add_action( 'woocommerce_before_checkout_billing_form', array($this,'add_option_to_checkout' ));
 			add_action( 'wp_footer', array($this,'add_script_on_checkout' ));
 			add_action( 'woocommerce_cart_calculate_fees', array($this,'calculate_cost' ));
 		}