Problem with targeted actions

I'm triying to setup a simple API to retrieve nodes and act on them.
The default retrieve and index actions work fine, but when triying to define a custom targeted action i can't get it to work and receive 404 errors when posting.
I currently have this:
/api/movie/ -> List all nodes
/api/movie/794 -> Gets node id 794
I need to do certain actions, like getting/generating the movie url, or "buy" the movie, so i'm triying to create the following:
/api/movie/794/play
/api/movie/794/buy
This is my code:

'targeted_actions'=>array(
            'buy' => array(
                'help' => 'Buy a movie',
                'file' => array('file' => 'inc', 'module' => 'api400'),
                'callback' => '_api400_buy',
                'access arguments' => array('view'),
                'access arguments append' => TRUE,
                'args' => array(
                    array(
                        'name' => 'id',
                        'type' => 'int',
                        'description' => 'The id of the movie to buy',
                        'source' => array('path' => '0'),
                        'optional' => FALSE,
                    ),
                    array(
                        'name' => 'test',
                        'type' => 'string',
                        'description' => 'Currency Code',
                        'source' => array( 'path' => 1 ),
                        'optional' => TRUE,
                    ),
                ),
            ),
            'play' => array(
                'help' => 'Play a movie',
                'file' => array('file' => 'inc', 'module' => 'api400'),
                'callback' => '_api400_play',
                'access arguments' => array('view'),
                'access arguments append' => TRUE,
                'args' => array(
                    array(
                        'name' => 'id',
                        'type' => 'int',
                        'description' => 'The id of the movie to play',
                        'source' => array('path' => '0'),
                        'optional' => FALSE,
                    ),
                ),
            )
        ),

and for the "retrieve" action:

      'retrieve' => array(
        'help' => 'Retrieves a movie',
        'file' => array('file' => 'inc', 'module' => 'api400'),
        'callback' => '_api400_retrieve',
        'access callback' => '_api400_access',
        'access arguments' => array('view'),
        'access arguments append' => TRUE,
        'args' => array(
          array(
            'name' => 'id',
            'type' => 'int',
            'description' => 'The id of the movie to get',
            'source' => array('path' => '0'),
            'optional' => FALSE,
          )
        ),
      ),

When posting to /movie/794/play i'm getting a 404 error (Could not find the controller)
And there's nothing relevant in the system logs.

Thanks for your time