Finally, the new omada controller 5.15 seems having API endpoint about Hotspot and vouchers
Omada controller doc

  @tlt 

I believe its only for windows controller not the web/cloud but theyre implementing it.

I mainly use the Linux version and it is implemented there too.

After some investigation, you can use the "Get authentication record list" API. It gives you all the user-voucher informations in a list.

All you have to do is then to filter the result by IP address.
I am still testing the implementation

  @tlt 

I cant test it since im using cloud/web based controller