PHP - Passing data from a site to another site securely

Question

I have a site that can take requests from multiple sites. Sort of like a upgrade check. These sites will send info like user names, passwords, app version etc, then my site will

Answer 1

Use .htaccess to modify and cloak the url of your website. eg:

www.mysite.com/index.php?cat=1234&foo=5678

will be looking like:

www.mysite.com/cat-1234-foo-5678-index.html

when u successfully create the .htaccess file, both the urls will act the same.