Thanks Julian ! But, what if I want to somehow get the users entered password into that action hook ? Any thing I can do to get the password in the create User HOOK ?

I want to be able to achieve the following feature : "When user registers AS A NEW USER to the NodeBB Site SUCCESSFULLY, I want to create a same user to some other appplication with same username and password".

Query : Any HOOK that I can intercept to achieve this feature ? Also, can I get the username and password as part of parameters for that HOOK ?