# Callback Running User and Debug Logs

A publish callback runs under the Automated Process user. As a result, all records that are created in a callback have their system user fields, such as `CreatedById` and `OwnerId`, set to `Automated Process`.

You can explicitly set the `OwnerId` to another value. For example, to assign a task to a specific user, set the task `OwnerId` to that user’s ID.

To collect debug logs for the callback’s execution, add a trace flag for Automated Process. For more information, see [Add a Trace Flag Entry for the Default Automated Process User](https://developer.salesforce.com/docs/atlas.en-us.platform_events.meta/platform_events/platform_events_subscribe_debug_autoproc.htm) in the *Platform Events Developer Guide*.

When the callback is invoked, it’s logged in the debug log. Logging for the callback requires the System debug log level to be set to at least Info. For more information, see [Set Up Debug Logging](https://help.salesforce.com/s/articleView?id=xcloud.code_add_users_debug_log.htm\&type=5). For example, when the callback is invoked, the debug log line looks as follows.

```nolang
CODE_UNIT_STARTED [EXTERNAL]|platform.event.publish.callbacks.tasks.apex.ApexCallbackMethodInvoker
```