# 1. Abonnement: Hent hændelser

Følg abonnementer når `INDSÆT`/`ÆNDR`/`FJERN` handlinger sker med "Farm", "Field", "FieldSatelliteImage", "RasterAnalysisMap", "VectorAnalysisMap", andre enheder.

Abonnementsmekanismen er bygget oven på MQTT og WebSocket. Vores anbefaling er at starte integrationen ved at læse [AWS AppSync-abonnementsartiklen](https://docs.aws.amazon.com/appsync/latest/devguide/real-time-websocket-client.html). 

{% hint style="info" %}
Abonnementshændelser sendes så snart hændelsen er sket i GeoPard-backend'en.
{% endhint %}

{% hint style="info" %}
Hver abonnementsbegivenhed har en unik identifikation kaldet `uuid`, hvilket er nyttigt til at filtrere behandlede og savnede begivenheder anmodet fra [82. Forespørgsel: Gendan abonnementsbegivenheder](/geopard-tutorials/dnk/api-dokumentation/oversigt-over-geopard-api-anmodninger/82.-foresporgsel-gendan-abonnementsbegivenheder.md).
{% endhint %}

{% code lineNumbers="true" %}

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

{% endcode %}


---

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