Hello Davegprryproofing, thanks for your query about viewing cash payments that you have received. In order to do this, if you have recorded under payment method on you invoices/sales receipts cash, then you can run a report to view this.
You can run a transaction list by customer report or a sales by customer detail report> go to customise in the top right> go to add columns>put a tick in payment methods> go to filter> under payment methods change from all to cash> run report. If you want to remove other transaction types you can filter in the same filter section in the customise part transaction type to just be invoices. You can also untick in the add columns section any you do not need. That will then show the invoices paid by cash.
Any questions let us know.