lenskart trick for using gv or coupon with paytm 50% cash back offer

this trick is confirmed. i myself used this trick. for this trick pm me.
t&c of paytm offer
Get 50% Paytm cash when you transact using the Paytm wallet at Lenskart.com
Minimum transaction of Rs.300 is required
Maximum cash back of Rs.1500 can be availed
Valid for 6 transactions per user
Cashback will be credited within 7 days of availing the offer
Not applicable on Premium brands ,Contact Lenses & Lens solutions
Cash back will be cancelled in case of partial/full refunds or cancellation of orders
Mobile number needs to be verified to be eligible for cash back