How to get agreementId after Widget is signed?

Hello everyone,

I have a question regarding widgets. I have created a widget without redirecturl. I don't want to be redirected in my process, so I decided to use an embedded widget.

I have included the iframe code of the widget in my html and added a event listener in Javascript as described in Documentation.

When a user now signs the agreement, the eventHandler is triggered and my application knows that the agreement has been signed. But how do I get the agreementId of the created agreement?

Kind regards,

Jakob