When OneSpan Sign’s User Interface is being integrated into an iFrame, the Event Notifier can send event notifications to the person who is integrating. This is useful if the integrator wants to be notified when certain steps of the integration have been accomplished. The attachment is an example for listening the “package complete” event. For more information, you can have a check of this page: https://docs.esignlive.com/content/c_integrator_s_guide/event_notifier/event_notifier.htm
And for the attachment, we are encountering some file uploading issue, the code is at the 6th floor of this thread. You can simply change the Notification Event Types to “ESL:MESSAGE:SUCCESS:SIGNER_COMPLETE”.