Custom built OpenWRT Captive Portal

I need a custom Captive Portal to be built based on OpenWRT Chaos Calmer. (Device Details: GL-iNet M300N) The Authentication Server / Login Page is already built and is hosted online, and is flexible towards changes for the Captive Portal. Criteria: - NO RADIUS server is used - Authentication Server / Login page is very simple, user logs in via Facebook or Twitter, on successful login it will redirect the user to [login to view URL] - This DNS name should be saved locally on the OpenWRT device and unlock the internet for the user - Upon successful login, the user will be directed to a Welcome Page (hosted Externally) - TCPDump to API URL with connected devices every 5 minutes - API will respond with MAC Address if user needs to be booted from portal - The device must automatically access a URL every 30 minutes with specific data in the URL, this will be used as a 'heartbeat' for the device *** ESSENTIALS *** - HTTPS & HTTP should be supported, for example: If a user has not authenticated and types in HTTPS://[login to view URL] it should redirect them to the login page, and if they type in HTTP://[login to view URL] it should redirect them to the login page. - Device will use Facebook & Twitter as user logins, this must be useable - The Captive Portal must be compatible on ALL OS devices I have attached a full specification, including the links to the test login page. DO NOT BID WITHOUT READING THE PROJECT BRIEF.... THE BUDGET FOR THIS PROJECT IS £250, UNFORTUNATELY, WE CAN NOT NEGOTIATE ON THIS.