curl --request GET \
  --url https://api.withallo.com/v2/api/webhooks/event_types \
  --header 'Authorization: <api-key>'

{
  "data": [
    {
      "name": "call.received",
      "description": "Inbound call received"
    },
    {
      "name": "sms.sent",
      "description": "Outbound sms sent"
    }
  ]
}