Badge scanning will be via the Mobile app component of EventSquid (our conf management platform). We are working to make sure each attendee has a QR code on their badge that enables this.
Each Sponsor will use either their phones default QR scanning capabilities or an app. The URL from the QR code on each attendees badge will add their contact info to your Mobile app site for the conference, which when done you can email those contacts to an email address of your choice. If you would like to see what this experience is like please access it here and use your EventSquid login and password https://www.eventsquid.com/mobile/5180