Android App Development for taking Appointments

We are looking to develop one android application which could help people to take prior appointments before going to any mobile or any other service centres or other offices, Hospitals, automobile workshops, hospitals, restaurants etc. Same as they get prior appointments while going to passport offices. You can visit [login to view URL] and signup as new user and signup click on apply fresh passport and then follow what it says. There will be an application on which mobile number OTP authentication using twiter digits and email i.d activation will be there. User will have to fill the form with these details. First Name and Last Name Present Address Permanent Address Current Mobile Number Working Email i.d OTP Sent on Mobile Number. Details of the Product in drop down. Main Category Electronics Sub Menu MobilesLaptops/Desktops TV AC Oven Main Category Automobiles Sub Menu CAR Bikes Two Wheelers Main Category Health Sub Menu Doctor's Clinic Hospitals Banks After filling all of the required details, a form will be downloaded with QR code and small fees will be paid and appointment will be given so that they could come only during their appointment [login to view URL] will ease the process of their services and they will not have wait there. An appointment letter will be generated and sent to user's mail i.d after filling all these details and same letter will be sent to concerned vendor's mail i.d and mobile number.