Originally Posted by
miikkak
INDECOPI regulation requires showing passport/DNI/CE when using credit cards without chip. This isn't an issue European or Peruvian cards as almost all of them requires using PIN instead of signature. Often other types of photo "ids" (student cards etc) are accepted but in theory all foreigners are required to show either passport or carnet de extranjeria when using credit cards without chip.
I'm not familiar with the regulation cited above, but as a point of additional info, the credit card I used in Peru has a chip, although it is chip & signature. In fact, a few clerks first tried swiping it without success; they had to insert the chipped card into the handheld machine for it to work.