How to know which field was updated when a contact was updated

I'm using the peopleUpdated webhook to get notified when contact is updated. However, the field or fields which were updated are not listed in the notification payload below:

[
{
"eventId": "43fe2b8a-093c-42b0-8fc6-5205cf8a3e78",
"eventCreated": "2022-08-15T14:30:00+00:00",
"event": "peopleUpdated",
"resourceIds": [
27713
],
"uri": "https://api.followupboss.com/v1/people?id=27713"
}
]

How do I find out which field update triggered this webhook?