I filed the I-130 petition at the Department of Homeland Security (DHS)office in Beijing. They forwarded info to Guangzhou. What is DOS? I do not know the meaning of DOS, SO and some other shorthands you guys are using around here. I sent the I-864 (notarized) to my wife and it is sealed. She has not opened it. I thought that I was not supposed to mail anything to Guangzhou. I thought she was supposed to hold on to the sealed I-864 , take it to the interview and only open it in front of interview officer on the interview day? LanBa, where did you pay this $65 fee?