what is the good callback url ?

My callback from paypal is returning this, automatically and correctly to the callbackpage and thankyou message, but it still doesn’t make the listing change to published and payd.

?status=thankyou
&tx=3XA30449XR817415C
&payment_status=Completed
&amt=0%2e21&cc=BRL
&cm=LST%2d374%2d20131011
&item_number=LST%2d374%2d20131011
&sig=RcUoK0c6kNbnrhn1ljnNHq5RH8khcRpLuU3ua9BDEF2EQ3PIaA1qVttWQqIgTjiMPNtPROC567a3VJ79t53i6k0XfNFT7v%2feHNDZTmxG9LH%2fpBm4m5VMsJhMMM3ttPpzRtD5BLuAl%2fONoBBGGxHR4QdJ7owEGPHl%2fZLdmUSRUBk%3d

What are the correct url from a good callback url ?
Where this st variable comes from? Paypal guy said it’s supposed to be payment_status=Completed, not st.
Ideas?
[]s