As I have seen many user's are struggling on how to apply the coupon code while booking a ride with ola.
The coupons which you guyz provide should apply at the end on the driver's mobile phone.
e.g.
Once you are done with the ride and the charges says by the driver you asked him/her to apply the coupon code you have (customer should have a coupon code with them)
so it's easy for the customer to apply the same.
Regards,
Richi