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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.
This could be useful for ProvaDent, but there are surely other formulas. There is a certain appeal to this but I will just share the most paramount ones now.