Originally Posted by
LCUF
SmartEX uses 3D Secure technology to validate the credit cards and It's also possible that the banks are automatically blocking foreign transactions they think are fraudulent so might need to give the banks a call to see if they see anything on their side.
3D Secure 2.0 https://www.cardservice.co.jp/servic...ard/3d_en.html from Atadistance
My understanding is that most US cards which do actually implement this without having to call in first send a validation sms or e-mail (Mastercard option?). Chase used to be able to process 3DS via phone call with Chase fraud/Verified by Visa agent AND send an sms, so purchases made within Japan would may need sms receive for the number on file.
The process
What to do if US issued card blocks international/overseas transaction
https://www.flyertalk.com/forum/36092303-post121.html
Amex issued card might be the best to try first for least hassle if people have one
https://thepointsguy.com/credit-card...card-security/ I've read Discover tends to work like JCB in Japan so that might be more compatible, too.
Last edited by freecia; Mar 24, 2024 at 3:13 pm