Implement PRG to avoid duplicate form submissions

[ZenitH-AT]

https://en.wikipedia.org/wiki/Post/Redirect/Get

[ZenitH-AT]

The main issue is that our system is very susceptible to page refreshes resubmitting form data and inserting duplicate records. We don't have a lot of time but I will research more later in the week.

[ZenitH-AT]

Just need to implement something like this:

$get_info = "?paid"; //for example... we dont always need to use this

header("Location: ".$_SERVER['REQUEST_URI'].$get_info);
exit();

[ZenitH-AT]

We would include $get_info in places where there is an if statement that uses the get parameter (e.g. payment page success dissmissable).

[ZenitH-AT]

This could be done to remove all the lazily implemented js popups i used