Guys. This is the reply I received today after enquiring about several failed attempts on shopee purchase few days ago. I did, however, make one successful transaction 10 days ago. I guess they stop accepting it for now?

Greetings from Shopee.

Kindly be informed that as per checking with our relevant team, we do not accept BigPay prepaid mastercard. Therefore, I strongly suggest you to make the purchases using other payment method or other card. Hope this clarifies, for further assistance do not hesitate to contact us.
Thank you for using Shopee!

Warmest Regards,
Loshini
Shopee Team