An SBM Smile Card is a prepaid card. It is not linked to your bank account. It is just a bank card which you have to put money on before using it to buy things.
Think about it like a top up card people use for calling abroad. Calls made on that calling card do not appear on your telephone line bill at the end of the month.
Similarly Paypal transactions on the SBM Smile card will not show on your SBM bank account.
Hope that makes sense.