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.
Hi! I love cats very much and will gladly take your cat for temporary care. I have always had pets in Russia, and I miss them very much here. Unfortunately, I don't have the opportunity to have my own now, so I will be happy to sit with yours for a small fee. You provide everything your pet needs: food, litter, toys and other important things. I provide care...
