This endpoint is used by marketplace operators to configure the accounts of sellers that have already accepted the invitation to join their marketplaces.
If the marketplace uses the Seller Invite feature, it should be called after the Create Seller from Lead request.
For marketplaces to add sellers without the Seller Invite feature, call this endpoint directly.
This call includes all of the information a seller needs to acitvate their account. Without going through this step, the seller's account will not function properly.