My thehabbos Client API Refuses To Work...

I apologize if this sounds like a total idiot question lol... but I cant get my thehabbos API to work.

Client Button:

Spoiler:

<a href="{url}/client" class="new-button green-button" target="eac955c8dbc88172421193892a3e98fc7402021a" onclick="HabboClient.openOrFocus(this); return false;"><b>Enter {hotelName}</b><i></i></a><br><br>

Soo.... ya I know that the link is /client by the way so dont say that I have to change it to /api.php because I know.... but when I do that it automatically redirects to (mylink/client.php) and doesnt work at all.... so please help. Oh and I use RevCMS IIS.