Each site has their own XML schema detailing what information can be pulled from Web Services. To view the schema for your site:
  1. Login to your site, it should begin with secure2.convio.net or secure3.convio.net. This determines whether you are in cluster 2 or cluster 3
  2. After this you should see a / and several letters. Those letters are your site's shortname
  3. Go to the following URL: https://webservices.cluster[2 or 3 depending on step 1].convio.net/1.0/[shortname]/wsdl