That's all there is to it. Your name is now "officially" on the list. Now all you gotta do is show up on November 9th at the Middlesex Lounge in Cambridge.
The money you just paid goes through XN, who hands it over to Jenn, who then goes and buys herself some shiny black thing and frowns at it by the sallow light of a dim bulb and contemplates the death of the universe.
Everything is all set, but if you want to be double sure, feel free to contact XN at 857-366-2310 (text is fine). He will say a bunch of sarcastic and demeaning things before assuring you that your payment, indeed, went through okay.