Accounting → Sales receipts → New receipt.
Use it when the money and the sale happened at the same moment: cash on the counter, a cheque in your hand, a deposit taken over the phone. No invoice is created and nothing lands in what you are owed, because nothing is owed.
The customer is optional
A walk-in has no name, and demanding one is how every anonymous sale ends up filed under whichever customer was nearest in the list. Leave it blank.
Where the money goes — and why this matters
The default is Undeposited funds, and it is not a technicality.
A receipt that put the money straight into your bank account would record the sale once. Then your bank feed delivers that same deposit, somebody categorises it as sales, and the income is counted twice — your profit overstated by the takings of every counter sale.
Undeposited funds is a holding account. The sale is income on the day it happened, and when the deposit shows up in the feed it simply moves the money from holding into the bank: a transfer between two of your own accounts, touching no income at all.
Choose cash on hand only for money that stays in the till and will never appear in a bank feed.
What it does in one step
Credits the income account on each line, books the sales tax, debits the holding account, and records the payment — one journal entry, because for this kind of sale the sale and the payment are one event.
Its number, and the other kind of receipt
Sales receipts are numbered SR-0001. Do not confuse them with payment receipts (REC-0001), which are proof that money arrived against an invoice that did exist. Different documents, different series, both called a receipt.
You cannot "send" a sales receipt
It is already posted and paid. What you send is the receipt document itself, from the payment it created — see Send a customer the receipt for their payment.