QUOTE(RyaNRiza @ Jul 7 2008, 12:13 AM)

Since you already have your case number you can already pay your document verification. Just follow the instructions on how to do it. It should be on Sheriff Uling's guide.
Good luck and congrats for finally having a case number!

I have not written it explicitly into the guide, but I recommend waiting until the USE has the hardcopy case files from the NVC. Then, the beneficiary is free to pay for the document verification fee (in addition to the visa application fee) anytime upto a month before the interview, which only applies to the document verification fee.
Cheers!!!
Sheriff Uling