In API documentation, it is simply stated that:
I have PHP script, which calls mautic and then mautic calls the script itself. I finally figured out how to make mautic write something else than "Callback is not valid." Now I am facing bigger issue. When the script is called again when returning from mautic, all I can see is this:
When returned back, I have two new GET parametres. Example:
I looked into HTTP headers in mozilla web developers tools and found nothing.
So, I give up and ask here: How should I map the above two GET parameters to the four what the API documentation says?