Note: The Form Submission API only works with the Wix Forms app. Call GetAppInstance to confirm that the app named wix_forms is installed on the site.
Marks form submissions with ids as "seen". If ids are empty, all unseen form submissions are marked as "seen".
This endpoint marks the submissions as if they were seen by the site owner. Only site collaborators with the Manage Submission permissions can mark submissions.
You can only call this method when authenticated as a Wix app or Wix user identity.
This method doesn't return any custom errors, but may return standard errors. Learn more about standard Wix errors.