Record a sale that was paid for on the spot - no invoice, no waiting.

Retail and point-of-sale style businesses collecting payment immediately
Sales Receipts are for transactions where payment happens at the same moment as the sale - a walk-in customer, an over-the-counter job. Instead of creating an invoice and then a separate payment, you record both in one step.
See how Sales Receipts fits into a plan on pricing, or how Count My Bucks compares to QuickBooks.