Customize and integrate Time-slots-booking-calendar with the existing website

Customize and integrate Time-slots-booking-calendar [login to view URL] The website is php v 5.2.17 with codeigniter. information on source code : [login to view URL] Customization > 1. Need to repeat module (Time-slots-booking-calendar) for every venue in website and only admin can activate or create one. 2. From create and manage calender and bookings given in admin panel, Only bookings need to be provided in User account dashboard to approve and control booking (client side) 3. Pay U payment gateway integration (already integrated within website need to integrate with this) 4. Show all the payments made for a particular Venue (for different calenders) Amount at one place 5. At front end, switch calenders with dropdown or tab{ajax} (calender 1, 2, 3) . can view availability with same calender by choosing option