Create a Feishu group and invite yourself only.
Create a Feishu bot in Settings
> Bots
> Bot
> Add Bot
> Custom Bot
> Add
.
The Webhook URL will be generated after creating the bot. Copy it and it will be filled into the "hook" field in the configuration file.
In the "Security Settings" section, select Set signature verification
, then a key will be created. This key will be filled into the "secure_key" field in the configuration file.