I have spent days, integrating "add to cart" and "minicart" into a SS3.2 project. The booking procedure for this project is very complex, products and prices are created on the fly, so a regular one-product::one-price approach with a catalogue and integrated gateway wasn't an option. Everything is set up finally and the payment with my sandbox test account works fine.
However I am only now realizing that I will need to also have an IPN listener to confirm that the payment was successful. I have found the PayPal php sample. But I am wondering where to actually put it and how to call it without breaking anything else. As far as I understand this php file is called directly through the PayPal config and has no UI. If I place it in my project > code folder I can't access it. Would it make any sense to add it to my Order Page and call that instead?
I'm lost. Any help is greatly appreciated.