In contrast to the "public key", the private key is in any case to be kept secret and is in principle comparable to a PIN or TAN in online banking. You should not tell anyone about the private key, but you always need it if you want to send coins from your wallet. When the wallet is created, both the public and the private key are generated. At our crypto vending machine you get the private key and the public key printed as a paper wallet directly.
The private key is to be kept secret in any case. It is recommended that this key be shared with anyone and that you keep it in a safe place.
On our paper wallet, the private key, consisting of letters and numbers, is also printed as a machine-readable version in the form of a QR code.
This offers the possibility with the mobile phone and an associated digital wallet to read / import the QR code quickly and easily.