In absolute terms, there is not always an obligation to be professional in order to sell on marketplaces . But to make a certain volume of turnover, it is necessary to have a professional status.
For individuals who wish to become sellers on marketplaces, the simplest is to opt for a status of auto-entrepreneur, or micro-enterprise.
The sales activity on marketplaces requires a minimum of administrative and fiscal procedures as for physical sales in order to be in order and to be able to develop sales.