Just call them - if they can see the transaction in the system, you don't even need the approval code. They can change it to flexipay for you on the spot.

Approval code stated on transaction slip. Required for SMS request.
You can try calling in or email too. I've tried all three modes and all approved.

thx for the info on the approval code. didnt know got such thing for sms flexipay application. 

i have 5 flexipay running concurrently. this feature is extremely useful particularly when you purhcase large sum at a particular merchant and to manage cashflow. in my case, i had my kitchen cabinet 1x, curtain 1x, electrical appliances 3x portions as i purchased them for staggered delivery.

request is very fast. call in, verify your details, tell them which particular transaction+amount, ask for flexipay 9-mth 0%, the moment you put down your phone you will receive SMS that flexipay has been triggered.