> For the complete documentation index, see [llms.txt](https://docs.geopard.tech/geopard-tutorials/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.geopard.tech/geopard-tutorials/fin/api-dokumentaatio/geopard-api-pyyntojen-yleiskatsaus/1.-tilaus-hae-tapahtumat.md).

# 1. Tilaus: Hae tapahtumat

Seuraa tilauksia kun `LISÄÄ`/`MUUTA`/`POISTA` toimintoja tapahtuu kohteilla "Farm", "Field", "FieldSatelliteImage", "RasterAnalysisMap", "VectorAnalysisMap" ja muilla entiteeteillä.

Tilausmekanismi on rakennettu MQTT:n ja WebSocketin päälle. Suosituksemme on aloittaa integraatio lukemalla [AWS AppSync Subscription -artikkeli](https://docs.aws.amazon.com/appsync/latest/devguide/real-time-websocket-client.html). 

{% hint style="info" %}
Tilaustapahtumat lähetetään heti, kun tapahtuma on tapahtunut GeoPard-palvelimen taustajärjestelmässä.
{% endhint %}

{% hint style="info" %}
Jokaisella tilauksen tapahtumalla on yksilöllinen tunniste nimeltä `uuid`, joka on hyödyllinen käsiteltyjen ja puuttuvien tapahtumien suodattamiseen haettaessa [82. Kysely: Palauta tilauksen tapahtumat](/geopard-tutorials/fin/api-dokumentaatio/geopard-api-pyyntojen-yleiskatsaus/82.-kysely-palauta-tilaustapahtumat.md).
{% endhint %}

{% code lineNumbers="true" %}

```graphql
subscription FollowPlatformEvent {
  followPlatformEvent(userUuid: "<placeholder_of_user_uuid>") {
    uuid
    userUuid
    toiminto
    nodePath {
      entiteetti
      uuid
    }
  }
}
```

{% endcode %}


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