50% cashback through Hdfc cards on Ola rides
https://blog.olacabs.com/use-your-hdfc-creditdebit-cards-to-pay-for-your-ola-rides/

HDFC and Ola come together to help make your move to a cashless economy, seamless. Just use your HDFC credit/debit cards to pay for your Ola rides

What’s more, we have an offer exclusively for you! Get 50% cashback up to Rs.100 on your next 2 Ola rides when paid using your HDFC Credit & Debit cards.

T&C:

Offer starts on 29th November 2016.
No Coupon code is required for the offer.
Pay through an HDFC card for the ride during the offer period.
Cashback will be processed in the form of Ola Money within 3 working days after the ride.
This offer cannot be clubbed with any other offer.
Cashback applicable only on Micro, Mini, Prime and Lux category.
Ola reserves the right to withdraw/modify the offers at its own discretion.
This is a limited period offer.