Missing one crucial feature

I like their Payment Forms setup for simple cases, but for my needs, the legacy 1.6 system works better. (I don’t know the final price ahead of time — it’s calculated in my system depending on the order.)

However, what I don’t see anywhere in their system is feedback following a purchase attempt. Yes, they direct to a success or a failure page, but there’s no way to connect the data that page receives to a specific sale attempt. My system can’t know what to (automatically) deliver to whom because there’s no identifier on the results pages to indicate what transaction it was linked to. If this functionality exists, I couldn’t find it in the documentation, and there’s no way I can find to include an order id in the $_POST or $_GET data sent to the pages. I can only get the Stripe charge ID, but I don’t have access to that earlier to store it in my database linked to a particular transaction.

So it’s good for SIMPLE stuff with manual follow-up, but it doesn’t work for me. I should have taken the word SIMPLE in the plug-in name more literally, but this seems like a really basic function to me.