QUOTE(Human Nature @ Oct 12 2015, 01:12 PM)
you need to read the T&C, i remember there is a clause about this
actually PBB has been generous with their weekly bonanza cashback compared to other banks...and since i have obtained the cashback several times, i consider it to be easier

Only 2 clause mentioned about that, but still didn't clarify my queries on later approval on sup card:
The principal credit cardmember with multiple credit card is required to register only one principal credit card number once and thereafter, the amounts charged on all other credit cards and the supplementary card(s) shall be automatically tracked for the purpose of tabulation the Qualifying Retail Transactions.
The Bank will not be held responsible and reserves the absolute discretion to disqualify any registration from a supplementary cardmember, duplicate entries, incomplete/ inaccurate SMS, late entries, error message, unsuccessful registration due to network failure and/ or interruption experienced by a Telco Operator or for any reason whatsoever as the Bank may in its absolute discretion deem fit.