By law, the agent could only claim commission from Buyer or Seller but no both side.

In Klang Valley, normal practice the Seller who is the party to pay commission to agent upon the transaction is deal.
There are also cases where the Buyer pay commission to the Agent with the condition that the Agent will help the Buyer to source property on behalf; but must be agreed by the Buyer in advance.

In JB and P.Penang, there are different practice.
The agent will claim 50% from the Buyer and 50% from the Seller.

This is what I know so far.