CHECKMATE
As per your post, we have studied your whole requirement with attached file. We have sufficient knowledge to complete the work.
You need to develop a Mobile which have some functionality like "Check In" , Get the User Profile from social media, create a user profile, QR code, Chatting function, admin panel.
Please share your best time for communication so we can discuss about the project.
Thank You and Have a Good Day,
Dipika - Vital Technosys.