discounts

add_filter( 'woocommerce_cart_subtotal', 'bbloomer_slash_cart_subtotal_if_discount', 99, 3 );

function bbloomer_slash_cart_subtotal_if_discount( $cart_subtotal, $compound, $obj ){
global $woocommerce;
if ( WC()->cart->total > 0 ) {
$new_cart_subtotal = wc_price( WC()->cart->subtotal - $woocommerce->cart->get_cart_discount_tax_total() - $woocommerce->cart->get_cart_discount_total() );
$cart_subtotal = sprintf( '<del>%s</del> <b>%s</b>', $cart_subtotal , $new_cart_subtotal );
}
return $cart_subtotal;

}




//add_action( 'woocommerce_cart_calculate_fees','woocommerce_custom_surcharge' );
function woocommerce_custom_surcharge() {
  global $woocommerce;

	if ( is_admin() && ! defined( 'DOING_AJAX' ) )
		return;

	$percentage = 0.01;
	$surcharge = $woocommerce->cart->cart_contents_total-$woocommerce->cart->get_cart_discount_tax_total();
	$woocommerce->cart->add_fee( 'Surcharge', $surcharge, true, '' );

}



function prefix_add_discount_line( $cart ) {

  $discount = $cart->subtotal - $cart_discount_tax_total - $cart_discount_total;

  $cart->add_fee( __( 'Down Payment', 'yourtext-domain' ) , -$discount );

}
add_action( 'woocommerce_cart_calculate_fees', 'prefix_add_discount_line' );