This shortcode allows you to collect and parameters passed to your membership page in the URL.
There are several ways to pass variables from one page to another page:
Sessions – Invisible, stored safely on the server, tied to a cookie.in the visitor’s browser.
Cookies – Invisible – stored in the browser
POST variables – Invisible, passed to a page from a form on the previous page. Cannot be used with links.
GET variables – Visible in the URL, can be passed from forms or links to a page. This is called a “query string”.
You can even pass information from a page on one site, to a page on another site running completely different software. Memberium enables your WordPress site to use the values passed through the query string / URL. It’s important to not pass any secure or sensitive data through the URL GET parameters, beause the data is visible in address bar of the browser. It can be tampered with by the user, cached in proxies, or reviewed later using the browser history.