This is the most polite way to say it, with pronunciation guide included for gringos:
Do you have ID?
¿Tiene identificación?
tea-EH-neh ee-den-tea-fee-caw-SEE-OWN?
Do you have a receipt?
¿Tiene un recibo?
tea-EH-neh OON ray-SEE-bow?
The [CD / video] is opened.
El [CD / video] está abierto.
ell [SAY-DAY / bee-DAY-oh] ess-TAH ah-BEE-AIR-toe.
You cannot get any type of money back.
No podrá obtener ningún tipo de reembolso.
Noh poe-DRAW ohb-tay-NAIR neen-GOON TEA-poe DAY rehm-BOWL-sow.
You can only exchange it for another of the same title.
Sólo se podrá cambiar por otro del mismo título.
SO-low SAY poe-DRAW comm-BEE-are pore OAT-row dell MEEZ-moe TEA-too-low.
I hope that helps.
Espero que le ayude.
Ess-PAIR-oh KAY LAY ah-YOU-day.