Moving and selling a Cyke kids' bike. 21 wheels, rack, gear shifting, dynamo-powered flashlight. The bike was bought in Belgrade last year. Selling for 70e / 8,000 RSD.
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.