Receipt

DEF: A piece of paper or message proving that money, goods, or information have been received.

EX: If you need to return the jacket, please bring the receipt with you, to prove that you bought it here.

Merriam-Webster Online Dictionary
receipt (noun)
1.
- recipe
2.
a) obsolete - receptacle
b) archaic a revenue office
3.
the act or process of - receiving
4.
something - received usually used in plural
5.
a writing acknowledging the receiving of goods or money
receipt (verb)
transitive verb
1.
to give a receipt for or acknowledge the receipt of
2.
to mark as paid