e commerce query

mithlesh kumar (CMA Intermediate ) (65 Points)

18 April 2019  
We sale our products in online portals and if invoice generated on 28 feb 2019 and we paid GST on it and filled GSTR -1 on dated 5th Mar 2019, and on dated 6th Mar 2019 customer cancelled the order, so how we can reverse our GST paid amount

customer is unregistered...