All events sent to the callback url will be in the body of a POST request. This post request will contain properties that will be included on every request, regardless of event type. These include content, eventType, enqueuedDateTime, iTwinId, messageId, and webhookId. The content will vary based on what event has been received. See below for a list of properties included inside the content for each event type.

The following is an example of what will be received for an event.

{
    "content": {
      // event specific properties go here    
    },
    "eventType": "api.action.version",
    "enqueuedDateTime":"string",
    "iTwinId":"string",
    "messageId":"string",
    "webhookId":"string"
}