The first place I had a problem was actually a Honda (I think?) car rental office in Shinjuku, not a place where I expected a problem (and not the easiest thing

The first place I had a problem was actually a Honda (I think?) car rental office in Shinjuku, not a place where I expected a problem (and not the easiest thing to pay in cash, though that's what we eventually did). Then a few hotels and ryokans mostly around Nagano and Toyama. The 7/11 ATMs worked fine though (but the card didn't work to pay directly, it did at Lawson though, IIRC) so we just used cash everywhere, but I liked to keep trying to use the card, as I was really not sure what was happening. It's in a small hotel in Obama that I finally understood what was happening, after the woman first asked me to "write my secret code" on a piece of paper (she didn't know the keypad was attached to a long cord and that she was supposed to let me enter the PIN myself, her daughter figured - or knew - that). I don't really remember but I think we just didn't have many issues afterwards, once in the larger cities of the Kansai. It was kind of a pain to have to use cash so much because my card had a rather low limit on cash withdrawal at foreign ATMs (of course, my other card had been mailed by mistake by my bank to my former place just before I left). I just didn't expect at all that it would be so difficult in Japan.