espocrm-base/application/Espo/Resources/metadata/clientDefs/Webhook.json

{
    "controller": "controllers/record",
    "recordViews": {
        "list": "views/webhook/record/list"
    },
    "dynamicLogic": {
        "fields": {
            "event": {
                "readOnly": {
                    "conditionGroup": [
                        {
                            "type": "isNotEmpty",
                            "attribute": "id"
                        }
                    ]
                }
            },
            "secretKey": {
                "visible": {
                    "conditionGroup": [
                        {
                            "type": "isNotEmpty",
                            "attribute": "id"
                        }
                    ]
                }
            }
        }
    }
}