Myntra Rs.300 Off Coupon: Get at upto 90% Off on Myntra Sitewide Collection. Use Coupon (MYNTRA300) to get an extra Rs.300 Off. This Myntra Rs.300 Off coupon is valid only for New Myntra Users on Orders above Rs.999. Also we have a Good News for you, GoPaisa is hosting a 2X Cashback Event from 7th to 13th October for Our users. During this event, enjoy double cashback on Myntra orders . To know more about the 2x cashback, check "Cashback rates" section on the Myntra retailer Page.