Now, that's very obvious from number 14:
14. Payment not received by 2nd week of order confirmation will
be void. Please re-register with HP to reactivate the premium is
required and redemption process will begin from day 1.
Additionally, they take 3 days to process:
3. HP products and services are payable to Hewlett-Packard
Singapore (Sales) Pte Ltd via Credit Cards, Singapore Post &
SAM. Payment clearance for Singapore Post & SAM will require 3
working days.
So you are to pay by today or you WILL NOT receive your
goods.