Flatfile Portal 2.0
Unfortunately Portal 2.0 does not have a way to push custom data to your Webhook. As a possible workaround, you could overwrite your userID value with a custom payload. Otherwise, we recommend tracking the importId and using that to reference a custom value stored on your end. When the importId is returned in the Webhook, you can associate that with the data on your end.
Flatfile Portal 3.0
In Flatfile Portal 3.0, you have the ability to set up custom environment variables in your JWT. Any values passed to
.env will be returned in your Webhook, and can be referenced on import. For more information about how to configure your JWT for Portal 3.0, please see our developer documentation.