| Answer | Crossword Clue |
|---|---|
| REC | Proof of payment: Abbr. |
| CANCELEDCHECK | Proof of payment |
| RECU | Proof of payment: Fr. |
| CANCELLEDCHEQUE | Proof of payment in Toronto |
| RECEIPT | Payment proof |
| QED | End-of-proof abbr. |
| RCPT | Proof of purchase (abbr.) |
| RCT | Proof of purchase (abbr.) |
| RCPT | Proof of purchase: Abbr. |
| IDS | Proof-of-age items: Abbr. |
| QED | Abbr. at the end of a proof |
