Lufthansa follows the 24-hour rule, which allows passengers to make changes to their bookings or cancel their Flights within 24 hours of purchase without incurring any penalty fees,✅+
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.