I'm trying to port our public external mailing list to our SmarterMail 16 server, one of the things we have is a web form for users to subscribe/unsubscribe from the mailing list.  Trying to get that functionality, it looks like the new API has functions that might do this, but there is no documentation on the arguments/data for the calls OptInUser and OptOutUser. 

 

I'm pretty sure I can use the old-style SOAP API to add/remove a user (we have a bunch of code now that creates lists from our SQL customer database that I wrote in the dark ages that still works) but it won't trigger the Opt In Email confirmation request.  Could someone from SmarterTools explain these two API functions?  Or perhaps offer a better method of doing this?