I remember when I linked by BigPay to iTunes account linked to iPad, it asked for CVV and TAC before I can even store the card number.

So if you didn't enter TAC to validate first time, how iTunes get to store your card number for reuse?

Let me give an unsolicited advise:

Use BigPay card - or any prepaid card - for Paypal, Lazada, Shopee, iTunes, Play Store.

I already removed any credit card and debit card that I used before. I don't even use my debit card anymore at payment terminals.

Hassle to transfer slightly higher amount than anticipated to cover immediate purchase. But that's the idea. Fraudster cannot execute, and I cannot go over budget.

Because when I use BigPay card with Shopee, it will always fail to deduct properly. I'll be left wondering for ½ hour waiting for money to reappear.