If you are going to pay bills frequently in Sam's Groceria, please remember to sign up your membership before you pay. RM 12, free for life and comes with free RM 10 voucher.
RM 1 = 1 point, 1000 points can redeem RM 10 voucher.

Do it before you perform any transaction because it cannot be backdated.
You can also pay the membership fees with CC and earn cash back.

Good idea, tonnes of parking space in Poslaju Centre KL in Brickfields.
Just park there and walk over, not even 2 minutes, you will reach Nu Sentral and that's the floor which Sam's located at.

Well, AmEx is nothing great these days. So, they are using credit cards which give cash back for groceries to reload in Jaya Grocer. Gives better return despite the 0.53 service charge.
Since 10th August. You are more than a month late.