I'm using HybridAuth 2.1.1-dev for authenticating with Laravel 4.
It works with Google and Facebook but I always get this error with Yahoo:
Undefined index: oauth_token
I registered a project on Yahoo Developer, with options:
Already changed in config file:
"Yahoo" => array("enabled" => true, "keys" => array("key" => "", "secret" => ""))
Finally it worked perfectly, for your information:
In HybridAuth config file, Yahoo configuration should be:
"Yahoo" => array (
"enabled" => true,
"keys" => array ("key" => "Your application key (Not application ID)",
"secret" => "Your application secret")
)