Immediately after logging in to GST portal, a pop-up for core business selection is showing as per attached image. The pop-up is asking for identifying the core business i.e. trader/ manufacturer/ service provider etc. This is mandatory in nature. If you want to change the selection in future, you may navigate to- My Profile >> Core Business Activity Status.
There are two methods for generating and paying challan under QRMP Scheme. First is Self Assessment Method (SAM) and Second is Fixed Sum Method (FSM); FSM is also called as 35% Challan Method.
An Invoice Furnishing Facility (IFF) facility has been provided to taxpayers under QRMP Scheme (Quarterly filers of Form GSTR-1 and also of Form GSTR-3B returns), as per sub-rule (2) of Rule-59 of the CGST Rules, 2017.