Aloha,
We paid our one Shearwater and three KBV MF$ online today.
The Shearwater site has been functional for a few years and worked as a returning account holder with no problem.
In order to get the web site to work for KBV, for each unit (owner number), we had to begin as a first timer to the web site. We used the same password for all KBV units (but different than Shearwater).
The web site has a few idiosyncrasies, but worked and provided confirmation numbers. During one attempt we did get an error message that directed us to phone call Wyndham to pay. That was when we decided we needed to register as a new user for each unit.
Jack