I forgot to mention! I looked everywhere online before the interview to pay the immigrant visa processing fee but couldn't find a place to pay online. On the day of the interview after we organized our documents and the lady at the window went through and checked to see they were all in order and met the requirements—then she gave us a paper to take to go pay the visa fee. You go out of the visa interview room, down the "walkway" and there is a little black gate. Indicate to the guard (they speak only Spanish I believe) that you were instructed to go pay. He'll let you go through the gate and you go down the other walkway (the US citizens side of the embassy) and in the huge heavy doors. Once you get through the security, go to the door on your left and once inside the room go straight to the window all the way on the left. You give the nice American lady your paper and then the money and then go back out and all the way to the immigrant visa section again. Make sure you follow the lines (like when you first enter the visa area) or else they will yell at you for trying to go in the exit (it was a much shorter route back!).
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