Just wondering if anyone faced this issue:

I'm trying to make some purchase from Japanese online shop. After making few transactions (separate orders), they said that the system is unable to verify my credit card.

So, I waited for the next day, then I was able to use my credit card again, but only for about 2-3 times then the same issue happens. I wondered if it is the online shop issue or OCBC issue, so I used my gf's supp card (I'm the principle card holder), and the transaction went through!

Why my card was not successful when the supp card is OK??

Now, I'm trying to buy from Amazon Japan and they said they could not verify my card.

I called OCBC twice, they said my available balance is good, but they did not receive any errors for any failed transaction, which means the Amazon Japan transaction did not even reach them.

Now, somehow I feel that my principle card is blocked in Japan, I have yet to try PayPal payments using my principle card.