Quiero is the right answer because Victor is talking in first person, so in english he would be replying with "I want to pay with a credit card." As opposed to saying "we want...or you want...or he wanted" because Fernando asked Victor "how are you going to pay?"
Bar-ba-ro
Esdrujula porque lleva el acento en la penultima silaba
No de mira nada en la foto lo siento
