The HOTP token is an event based token. You can paste a secret key or have the server generate the secret and scan the QR code with an Authenticator App turning your smartphone into an authentication device. But note, that some Apps might have limitations in the supported hash algorithms or other parameters.

Token data

The server will create the OTP key and a QR Code will be displayed to you to be scanned.

Some Authenticator Apps only support an OTP length of 6.

Some Authenticator Apps only support the SHA1 algorithm.