In regards to the Tizen Store, what is an "online sales business registration number"?

Hi, I'm new to business hijinks, and was trying to upgrade my status in the tizen store to commercial seller. But something that is needed is an "online sales business registration number", what is that? Isn't being an unincorporated group enough to register as a business or is there somewhere I have to go to get that job done?

Any help would be much appreciated.

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