Is registering a business necessary for receiving payments?

Hey guys,

I’ve set up a Shopify store for on-demand print services, but when setting up the payment methods I am always asked to give a “Business Registered Name”; an option to insert a VAT or not; and a “Registered Business Adress”. My goal is for the store to be a side hustle, but apparently I need to register it legally to be able to receive payments from my sales. I don’t know if it makes any difference but I am from Portugal.

Thank you for the help!

Diogo