Good guest WLAN portal solution?

Hi, perhaps this question is not completely FR related. But I'd like to ask this community anyway. What solution can you recommend for a Guest WLAN setup? We need a solution that provides a capture portal, so that the user can generate a OTP for a limited access. Also there must be a portal that the user agrees to the terms & conditions and only after agreement gets access. Mit freundlichen Grüßen, -- [*] sys4 AG https://sys4.de, +49 (89) 30 90 46 64 Schleißheimer Straße 26/MG,80333 München Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263 Vorstand: Patrick Ben Koetter, Marc Schiffbauer, Wolfgang Stief Aufsichtsratsvorsitzender: Florian Kirstein