One has to register the firm to give the legality to the business. And MSME is one of the registrations which can be taken, but due to amendment the person doing the business of trading are not eligible for MSME registration. Hence MSME is not for traders, only manufacturers and service providers can take MSME registration.
The trading business can be registered under any other ACT such as Shop & Establishment registration or GST or IEC any other registrations as applicable.
LegalWiz.in is here to help you to get the registration for your business.