curl --request POST \
  --url https://api.openfunnel.dev/api/v1/signal/get-signal-list \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <x-api-key>' \
  --header 'X-User-ID: <x-user-id>' \
  --data '
{
  "filters": {
    "signal_types": [
      "<string>"
    ]
  }
}
'

{
  "signals": [
    {
      "signal_id": 123,
      "signal_name": "<string>",
      "signal_type": "<string>"
    }
  ],
  "total_count": 123
}