Hey Skip,
I’m not sure our ticketing plugins are what you’re looking for; they are straightforward ticketing solutions and not comprehensive event management tools. There’s nothing like QR codes or mobile phone checkins built into them. Checking in is done through the admin dashboard of WordPress, or by a paper printout. If you’d like to see how the WooCommerce Tickets plugin would handle checkins, you can watch the video here: https://theeventscalendar.com/support/documentation/wootickets-new-user-primer/#wooshow
Does that make sense?
— Julie