$listItems->total()
Total price of the ListItems
$listItems->total(): null|Wagnerwagner\Merx\PriceReturn type
null or Wagnerwagner\Merx\Price
Description
The tax of the total keeps the tax rate the items share. Items with
different tax rates have no rate in common: tax->rate is null then and
tax->price the sum of their tax amounts. Use taxRates() for the
breakdown of such a list. A list whose items all come without a tax has no
tax either: tax is null.