Custom coding needed to integrate a third party plugin to a WordPress site

Enhancing/ developing specific functionalities for a WordPress website. The website works as a marketplace and allows registered users to post offers for services and events and buyers to purchase these. The users have various levels and badges which they unlock as they perform actions. The project consists in integrating a third party wordpress booking management plugin into a wordpress 3.9.2 website and ensure the plugin booking management functionality works as needed in the current website pages and work flow. There is a date field in the current theme listing page that will need to be replaced with the booking calendar provided by the new plugin. The vendor will have an extra menu in his profile allowing him to view & edit his calendar. The listings can be booked one time or several times (repeating listings) and by one or several buyers (like hotels - the plugin will have this possibility). If work related to this project is carried out successfully by a reliable freelancer at the right price I will consider to keep working together. Working language English. Previous experience customizing a premium theme is needed.