File GSTR-3Bpost https://api.sandbox.co.in/gst/compliance/tax-payer/gstrs/gstr-3b/{year}/{month}/fileRecipes👨🍳File GST Return-3BOpen Recipe👨🍳File Nil GSTR-3BOpen Recipe File GSTR-3B by passing the GSTR-3B Details response after offsetting liabilities for the authenticated taxpayer.