I want my flutter app to have multiple rooms using Agora

Hello i have a flutter app here and have intergrated agora my challange is that, Agora allows me to manually add a channel name and provides me with a temp token for video call which expires every 24 hours. i want to be able to connect agora with mysql database using php api and allow different users to enter into different rooms using an id from any user, how can i achieve this as i see that currently agora allows me to use one channel id