Note that in Hospitality mode this tab is called Receipts.
The paid tab shows you all of your sale and invoice history. Any of your sales, refunds and invoices that have been fully paid off will appear here as well as any voided invoices.
This is also where you can create a new refund, either from an existing sale or by tapping the new refund button at the bottom right of the page. You can read more about refunds in the Refunds section.
By default the Paid tab shows all your Invoices, Sales, Refunds, and Voided, but you can filter by selecting the appropriate filter at the top of the screen.
This filter shows invoices that have been paid in full or voided. All other invoices can be found in the Invoices tab.
The Invoices filter is only visible in Invoicing modes.
This filter shows any completed sales that were made from the Register tab. It will also show any register sales that were voided.
The Sales filter is only visible in Retail modes.
This filter shows any refunds that have been made. You can read more about how to create refunds in the Refunds section.
This filter show only invoices or sales that have been voided.
The Incomplete filter is a special filter that only appears in Retail mode if there are any incomplete sales. These sales were created in the Register screen but never completely paid off. They may have partial payments against them.
Generally if you have any incomplete sales then you should either pay them off or void them.
When in Invoicing & Retail mode any incomplete sales will end up in the Drafts section of the Invoices tab.
If you're in Retail mode, then any sales that where unable to be paid will appear here under the Incomplete filter. If you ever think you've lost a sale, then have a look here.