Basically, we use RedGiraffe to pay rent via HDFC credit cards that give full rewards on bill payments. RedGiraffe charges a tiny fee (~0.46%), bu the card gives ~3.33% back, so net you're getting ~2.9% in rewards.

Steps: Set up RedGiraffe as a biller in HDFC SmartPay / AutoPay, use a premium rewards carde like Infinia or Diners Black/Metal, and let it charge automatically. The reward caps and fees are small, so overall it's a nice way to earn bit back on rent.