* (s2Member/s2Member Pro) **Compatibility** Updated all of s2Member's IPN handlers to accept `$_REQUEST` data for Proxy-related variables like `s2member_paypal_proxy_return_url`. This allows s2Member® itself to use `$_POST` variables for Proxy-related variables; and it further reduces the likelihood of 403 Forbidden errors caused by [paranoid Mod Security configurations](http://www.s2member.com/kb/mod-security-random-503-403-errors/). One issue this should help to correct, is a mysterious case where a `success=""` Shortcode Attribute is not working as you might expect. This can be caused by [paranoid Mod Security configurations](http://www.s2member.com/kb/mod-security-random-503-403-errors/) at places like HostGator®, because a URL is passing through a query string. This release will help to prevent this from becoming a problem, because `success=""` URLs will be passed through `$_POST` variables now in all Pro Form integrations.