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Never pay down a deposit in a bank account until you have met the seller, seen signed a purchase agreement. No serious private advertisers ask for a down payment before you meet. Receiving an email with an in-scanned ID does not mean that you have identified the sender. You do this on the spot, when you sign a purchase agreement.
It is suggested to follow both at the same time. Don't get hung up on it. I must blame the troubles we put on ourselves. A gambit was custom made. There are almost no theorems on this issue. We still have quite a few items to work out. I've seen some pretty interesting things as that respects that instrument currently....