I posted this a few hours ago, but I’m having problems posting from my developer account so, I had to create a new account and reposting the original response below.
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should example.com/wp-admin/ sign me into both without an additional click?
No, If you send your users to your WordPress URL without the redirect to jsConnect URL you will be sent to WordPress Dashboard instead of Vanilla Forums.
Correct method for login and redirect to Vanilla
To have a seamless login use the jsConnect Login URL which will send users to your WordPress login and then redirect them to Vanilla logged in automatically.
https://WORDPRESS-ROOT/wp-login.php?redirect_to=https://VANILLA-ROOT/entry/jsconnect?client_id=CLIENT-ID&Target=%2F
Already logged into WordPress? Use the jsConnect URL.
If your users are already logged into WordPress and you need to redirect them to your Vanilla, use the jsConnect URL which initiates the check for a the currently logged on WordPress user and logs them in automatically:
https://VANILLA-ROOT/entry/jsconnect?client_id=CLIENT-ID&Target=%2F
jsConnect does not currently support auto logging on or auto-checking for a WordPress user, but using the methods above works just fine for me.
