I was trying to setup a subscription right after I purchase the Mist of Panderia expansion pack with the same card.

The website kept saying my postal code is incorrect, I called my bank and they mentioned the postal code that I keyed in is the correct one.
I went on to try a few more times and got message "Too many attempts"

Do look into the matter, it is very bad when I can purchase the expansion pack with the same card but not able to setup a subscription.