I believe your best bet on this would be to leverage our API which I believe you could call/query from your PHP application. 

I'm trying to clone users from a Wordpress site into SmarterTrack with SSO, so that a user created in Wordpress will be created in ST when a customer visits the portal. Your SSO solution says you can do this: http://help.smartertools.com/SmarterTrack/current/Default.aspx?qq=%2fSmarterTrack%2fcurrent%2fTopics%2fConcepts%2fSingleSignon.aspx 

All registration would be done through the WP site.

This could likely be done by your developer, and would probably take the form of a PHP based plugin that makes the necessary API calls to SmarterTrack when a new user is created in Wordpress. 

Create a user in ST using this function? http://portal.smartertools.com/services2/#svcOrganization_CreateUser And what about the SSO functionality in terms of being automatically logged into ST when you visit the portal if you're already signed into WP?

This I'm not sure on, I can try asking our developers to see if there is a particular call in the API they'd recommend. 

ST seems to have the ability to use an external identity provider to authenticate users, such as mentioned on this page under authentication method: http://help.smartertools.com/SmarterTrack/current/Default.aspx?qq=%2fSmarterTrack%2fcurrent%2fTopics%2fInstallation%2fExternalProviders.aspx but which protocol does this use? Like, OpenID or OAuth2 or SAML.

What kind of authentication cookie needs to be created in order for the GetSignInCookieInfo Method on this page: http://help.smartertools.com/SmarterTrack/current/Default.aspx?qq=%2fSmarterTrack%2fcurrent%2fTopics%2fInstallation%2fExternalProviders.aspx to work?

I can probably just redirect users on the WP registration page to a page where a cookie is set. Then when they go to the portal, they will be logged in via SSO using the GetSignInCookieInfo Method.

Can someone confirm that it's possible to create and also update user information using the API? And not just for organizations. It seems user creation is only listed for organizations in the API literature for some reason.

EDIT: Sorry all the information I wrote here is useless. It was for SmarterMail. My apologizes...

Is there really no way to find out if you can create and edit user accounts via the API? 

Hello Pantheon,

The API documentation for Organizations contains Users within it's umbrella alphabetically. When you have a chance review the SetUsersProperties and CreateUser sections within the API documentation.  

Best wishes!

So SetUsersProperties  can be used to update a user's info, like phone number, email etc.? Why are these functions under organization, though? Can they be used to create and update users that aren't part of an organization?