Working in Denmark for a Swedish company

I am an Italian student in Copenhagen, regularly regustered in Denmark. I will work remotely from Denmark as a Sales Representative for a Swedish company. The tax system applied is the Danish one, isn't it?  Which is the percentage of the Danish tax to apply to the gross salary? How much is the fixed cost to pay to the platform PeopleperHour? Once the employer pays me the gross salary through this platform, is there any action needed by me?