I have been using GrabPay and GPMC for last few months, but never explored "challenges".
Current challenge is to top-up $2100 from bank account or PayNow and spend $2k (in 25 transactions) to earn 20k points.
1. 20k points = $40. So, you get $40 by spending $2k, which is 2% cash back. Is this in addition to regular points given on transactions (which is about 1.2% cashback for Platinum members)?
2. Can I top-up $2100 from bank account (to meet the criteria for challenge), but add more funds from UOB Amex card to get 1.7% cash back, and spend from that, and then later transfer $2100 back to my bank account? How does Grab track "transferable funds" when I have topped-up using both bank account and credit card?