You need
RADIUS Manager doing the processing and MikroTik's hotspot system or
pfSense pointing to the customers.
This is not child's play. To get this lot working to that level you will need at least two months.
I trust this is an academic excercise. The 2.4GHz spectrum is now so congested that you can hardly get 50m range between a radio transmitting at legal levels and a laptop on the Greater Cape Town area. Using high power radios with high gain antennas that can transmit further will not only get the Powers That Be on your case, but will also make you no friends amongst the people who are transmitting at legal power levels.