Which type transit visa and who should deliver it ?schengen?

Question

am Cameroun national, travelling from Douala to Sao Paolo, Bresil, via Brussels and Madrid. So my routing is Douala to Brussels to Madrid to Sao Paolo, without making a stopover in Brussels neither in Madrid, so only in transit.
Which type of visa do I need and by which authority should my transit visa be issued ?

Answer 1

if you do not leave the airport you do not need any visa.
when you return with the drugs, they will put you in jail even if you are in transit.
they will know all about it before you will reach europe.