[angemon]

Originally Posted by ozzy47

That would be a no. All you need is the site URL. If you look in the template, the gateway is in a hidden field.

<input type="hidden" name="notify_url" value="{vb:raw vboptions.bburl}/payment_gateway.php?method=paypal" />

here you said NO it's only the website url that should be written , but in your first reply you told me to write in IPN the same thing @kh99 said.
6) And if you are specifying the IPN URL in your paypal account then make sure that is correct. If this is your forum:
http://www.vbulletin.com/forum/
Then the IPN URL should be:
http://www.vbulletin.com/forum/payme...?method=paypal

Also all the mentioned things are already made and didn't change anything , the only thing that I didn't get is this one, would you explain it more:
4) Make sure your forum directory is not behind a htaccess login because that will prevent paypal from accessing the callback URL.