Code-Snippets-Functions/Execute a function on a child site/WooCommerce/deposit-discount-on-backorder-products.txt

add_action( 'woocommerce_cart_calculate_fees', 'calculated_deposit_discount_on_backorders' );
function calculated_deposit_discount_on_backorders( $cart ) {

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

    ## Set HERE your negative percentage (to remove an amount from cart total)
    $percent = -.80; // 80% off (negative)

    $backordered_amount = 0;

    foreach( $cart->get_cart() as $cart_item ) {
        if( $cart_item['data']->is_on_backorder( $cart_item['quantity'] ) ) {
            $backordered_amount = $cart_item['line_total'] + $cart_item['line_tax'];
        }
    }

    ## ## CALCULATION ## ##
    $calculated_amount = $backordered_amount * $percent;

    // Adding a negative fee to cart amount (Including taxes)
    $cart->add_fee( __('Deposit calculation', 'woocommerce'), $calculated_amount, true );

}