# Webhook payload object common properties

Each Webhook event payload also contains properties unique to the event. You can find the unique properties in the individual event type sections.

^ Key ^ Type ^ Description ^
| [[action]] | string | Most webhook payloads contain an [[action]] property that contains the specific activity that triggered the event |
| [[sender]] | object | The user that triggered the event. This property is included in every webhook payload |
| [[repository]] | object | The [[repository]] where the event occurred. Webhook payloads contain the repository property when the event occurs from activity in a repository. |
| [[organization]] | object | Webhook payloads contain the [[organization]] object when the webhook is configured for an organization or the event occurs from activity in a repository owned by an organization |
| [[installation]] | object | The [[GitHub]] App installation. Webhook payloads contain the [[installation]] property when the event is configured for and sent to a GitHub App. For more information, see "[[Building GitHub App]]" |