I have a restaurant system in Laravel that manages customer credit. I need to: 1. Fix errors in loading this report, and also validate that payments can be made on invoices issued on credit. 2. The system natively handles automatic tip collection (10% of the sale value), which appears on the sales receipt. However, I need it to also print on the pre-bill. The pre-bill is a format already in the system that prints everything consumed by the table. This file is 100% functional; I just need to add a field to the printout that includes the tip amount.