We are currently traveling in China and in a pinch because it didn't occur to me to get PIN numbers for our credit cards. Our credit cards all worked fine in Europe and Japan as well as in the US with a chip plus signature procedure. No PIN.
When I called Citibank to ask that they send us PIN numbers, the customer service rep said :"Wow, I didn't know that" when I said Pin numbers were required here for in-person purchases with any credit card.
We're doing OK because I can make hotel reservations online without a PIN, and we are paying for food, gas and tolls with cash. A family member watching our mail will email us the PIN numbers when they come in the mail.
So I'm wondering, as we proceed with our world travels, if there are any other credit card wrinkles I should know about for various countries.