Hotspot Gateway-XML Server/AAA/External Login Page

I am working on a Hotspot for a hampton inn. Hilton(hhonors) requires them to use their login page for hotspot: link below. Is this possible to set up in the mikrotik? I cant figure out how to use these settings.

Authentication And Authorization Settings
AAA Services Enabled
XML Interface Enabled
XML Server 1 IP 192.251.124.30
XML Server 2 IP 0.0.0.0
Portal Page Enabled
Portal Page URL http://hsia.hamptoninn.com/hsia/servlet/AuthenticationRequest?GT=NOM&PROP=PRSTN&ZIP=38242&
Portal Post Port 80
Portal XML POST URL

Settings in setting up the remote access code change :s.

I am kind of confused on why they have to have it this way.