Link The offer is only valid for a bill payment made until the 15th Aug 2015. Make transaction through app The flat cashback of Rs.50 is valid only on your very first Cube payment. Transaction value must be Rs.100 or more. The cash back is valid on payments made using credit cards and debit cards only. No cashbacks for payments made via NetBanking or Citrus Cash Wallet. The cashback gets processed automatically after your 1st bill payment: No coupon code is required. The amount will be credited to your Citrus Cash account in real time. The money in your Citrus Cash Account can be used in Cube for recharges or bill payments.