Proof of purchase is evidence that you bought something where you say. Keep the proof of purchase, no refund without proof of purchase.
A receipt is the usual form, though a bank statement often does as well. Proof of purchase is about where and when rather than about who paid.
1nounproof of purchaseEvidence that you bought something where you say.
“They accepted a bank statement as proof of purchase.”
proof of purchase is evidence.
Practised in Shopping & Money