zendframework standard URL parameters - zend-framework

Question

i have problems with the zend framework 1, i use a paywall api and it use a pingback url methode, for example:
myurl.com/payback?user_id=123&foo=bar...
But the problem is now i can't read the params in zendframework.
It work only if i do it like that
myurl.com/payback/user_id/123/foo/bar
i used different methodes to read it out:
$q = $this->getRequest()->getQuery();
$p = $this->getRequest()->getParams();
the request object look like that:
object(Zend_Controller_Request_Http)[74]
protected '_paramSources' =>
array (size=2)
0 => string '_GET' (length=4)
1 => string '_POST' (length=5)
protected '_requestUri' => string '/index/paywall?uid=zIhvpyVslUS5ND79AfMeBPao1LjXY2Kc&goodsid=6001&slength=&speriod=&type=0&ref=&is_test=1&sig=c62538caf7a36ea2f3a795bb3dc32c07' (length=141)
protected '_baseUrl' => string '' (length=0)
protected '_basePath' => null
protected '_pathInfo' => string '/index/paywall' (length=14)
protected '_params' =>
array (size=3)
'controller' => string 'index' (length=5)
'action' => string 'paywall' (length=7)
'module' => string 'default' (length=7)
protected '_rawBody' => null
protected '_aliases' =>
array (size=0)
empty
protected '_dispatched' => boolean true
protected '_module' => string 'default' (length=7)
protected '_moduleKey' => string 'module' (length=6)
protected '_controller' => string 'index' (length=5)
protected '_controllerKey' => string 'controller' (length=10)
protected '_action' => string 'paywall' (length=7)
protected '_actionKey' => string 'action' (length=6)
I Hope someone can help me,
thank you