Some WiFi networks such as those you find on coffee shops, when we connect to their WiFi network it automatically redirects us to a web page where we will need to enter credentials in order to acess their network. Is the same possible with an android hotspot?
There are applications for your phone (root required) to do this. The most popular one is Paywall. You can also root your phone and just host a php or html page to do this and capture the info into the logs.