Problem with handling pubsub messages

Extensions
2 
$payloadArray = array(	"exp" => time()+5000,
		"role"=> "external",
		"channel_id" =>$CHANNEL, 
		"pubsub_perms" => array("send" => ["broadcast"])
			);

Your pubsub_perms appear in correct “send” should be an array of strings, not an array. Also don’t need user_id here