They where previously located in a.htm along with the leah id but they've since changed it so all have a pin of 0, babestation still use the same method they haven't updated yet.
Code:
<h4>Maddy Pervcam</h4> <div class="channel-tip paywall" channelid="3493" channelname="Maddy Pervcam" channeltype="leah"><span></span>TIP ME</div> <div class="clear"></div> <div class="tip-performer" leah_client="23" leah_user="2880" channelname="Maddy Pervcam" channelid="3493" pin="10496" channeltype="leah" style="display: none;"> <h3>Tip Maddy Pervcam</h3>