Best workaround to support for $_GET ?

[eluser]chefnelone[/eluser]
Hello

I'm working in a application which is linked to a external credit card processing services provider whose callback function only provides a response via $_GET.

I found a Topic about this and a workaround posted by <b>Al James</b>:
http://ellislab.com/forums/viewthread/56389/#277621
but since the post is more than 3 years old I'd like to know if is there a better trick to do the work?


In the same post Also Derek J suggested a small standalone script.
I just need the $_GET variables working in JUST one page/controller, which is the page recieving the callback from the provider.
Then I don't need to hack the entire application but having it just in 1 controller.
Would then a standalone script works me?

Thanks.