There is no such thing as a "Trading Key". The continued claim that there is such a thing is outrageous and ridiculous. If there really was such a thing, it would be easy for you to prove that it exists. A definition of some type, or a link to an official document which discusses what it is or what it is for. FACTS. But, of course, you can't. It does not exist. There is absolutely no such thing as a "Trading Key" for granting access to trading on any stock exchange or market. It is a complete and utter fantasy.