Paytm Bus Cashback Offer – Upto Rs. 100 Cashback on Bus Tickets. Paytm offers upto Rs. 100 cashback on bus tickets. Use the coupon code to avail this offer. Offer valid twice in a day and five times in a month per user. Cashback will be credited within 24 hours of the transaction. The user needs to have verified mobile number on Paytm to get cashback.