Enter a clue or pattern or both:
The Clue
Proof of purchase (7 letter answer)
The Answer
RECEIPT
Tags
Notes
The answer RECEIPT is rarely seen, appearing only about once every 1000 puzzles.
Related Clues
Payment proof
Register output
Register printout
Return requirement?
Canceled check, e.g.
Expense-account item
Expense report attachment
Ticket stub, e.g.
Slip on a new piece of clothing?
It often says "Thank You"
It often comes with a "Thank You"
Definition
RECEIPT as a noun:
1. (reception, receipt) = the act of receiving
2. an acknowledgment (usually tangible) that payment has been made
RECEIPT as a verb:
1. (acknowledge, receipt) = report the receipt of; "The program committee acknowledged the submission of the authors of the paper"
2. mark or stamp as paid