I accept the exchange.
'Cambio' — CAM-byo. Two syllables.
Say this when you decide to take an exchange rather than a refund. It confirms your decision and starts the exchange process. Useful when a refund is refused but an exchange is offered.
'Accettare' means to accept. 'Cambio merce' (literally 'goods exchange') is the standard Italian retail term for a product exchange. 'Merce' is a collective noun meaning goods — no article is needed after 'cambio'.
Va bene il cambio.
The exchange is fine.
Casual acceptance.
Preferisco il cambio al rimborso.
I prefer the exchange to the refund.
States preference explicitly.
Cambiamelo pure.
Go ahead and exchange it for me.
Very casual — implies you trust them.
In Italy, once you accept a 'cambio merce', you generally cannot later ask for a cash refund instead — the exchange is considered a new purchase. Think carefully before accepting if you would prefer money back.