How can i send an Invoice for $0

[OffshoreNW]

I use invoices to keep track of whos is on what trip. I give trips to charities to auction so invoices for these customers are 0 but they need the information on the invoice and I need the invoice to record who's on each trip. How can I send and invoice for $0?

[Pat8]

I need this feature in order to maintain consistency in the way I manage my clients and their records. It is disheartening that Square has not added this capability after 5 years of frequent requests.