I don't know and I don't think an EV driver has to care. Maybe it's not all intercharge, maybe there are more networks in the background.
The salient point is the consumer perspective: I can have one generic app to handle charging payments for basically any public charge point and I interact the same way with all of them, I put the plug in my car and scan a QR code.
The debate in that unified market is more about price discrimination, because prices at a given charge point may vary depending on who operates it versus who your e-mobility provider is. Which is quite annoying in itself and should be fixed. But paying 59 ct/kWh vs. 69 ct/kWh is quite different from having a dedicated "car charging apps" folder on your phone.
