I did not, I just applied for it.
Every course can be competitive depending on the credentials and amount of people applying.
I do not know anything about that program, but you can just browse through Seneca's overview of the program or check LinkedIn for people that are either studying that program currently or studied the program before for advise.
Do you happen to know if the employment prospects are good upon completion of this certificate? I have scoured linkedin and it seems as if a lot of students go on to do another certification in AML (like the one i mentioned ealier)