I am using Magento 1.9 and I get this error when I click on PayPal method.
PayPal gateway has rejected the request. ReturnURL is invalid (#10471: Transaction refused because of an invalid argument. See additional error messages for details). CancelURL is invalid (#10472: Transaction refused because of an invalid argument. See additional error messages for details). Here is my site link: http://dashmarine.com/Index.php/ Here I have a product 'bike' (please search in that search field so you will find)
Maybe this Index.php is a problem because I can not remove this from url. I tried to remove from backend but giving an error because rewrite module is not configured very well on my server. so hope this will not be a problem.
But Same PayPal account I integrate on another website which is from godaddy https://www.santebarley-uae.com/ is working very well.
Thanks in advance.