Yes, if you're carrying on a business (selling to make profit, even part time online), you're generally required to register with SSM, and running an unregistered business can attract penalties. The good news it's cheap and easy. Process: (1) Register a sole proprietorship (enterprise) via SSM's online system (EzBiz), you pick a trading name or use your own name, fill in the business nature (e.g. online retail), and pay the small yearly fee (very affordable, plus a bit more if you register a trade name). (2) You get a business registration cert, which you then use to open a business bank account, apply for platform seller verification, and for any grants or micro-financing. (3) Renew it yearly. Registering also protects you and looks more legit to customers. Some marketplaces are also tightening seller verification, so having SSM helps. It's genuinely a low barrier, do it properly from the start. Confirm the current fees and steps on the official SSM/EzBiz portal.