I told the gen 1 Leaf driver who showed up about it being free. He plugged right in and while he was there I pressed continue and and maybe no receipt. It had started by that point. He didn't use any app or CC.
Energy is measured in kWh, not "kw", I suspect your charging rate was above 40 kW but you received ~2 kWh of energy. Since you paid, you may have a received an email receipt like this (w/some info redacted). This was from when in my area, EA was still charging by time.
Thank you for charging with Electrify America.
08/11/2020 08:51:57 PM
Total paid: $0.93
Charging pricing: $0.00 + $0.18/minute (pre-tax)
Charging cost: $0.93
Discount: $ 0.00
Idling: $0.00 ($0.40/min)
Sales tax (0%): $ 0.00
End state of charge: 53%
Energy delivered: 4.6 kWh
Max charging rate: 55.27 kW
Charging time: 00:05:09
Grace period: 00:07 min
Paid idle time: 00:00
I cut it off at that point since my Bolt began tapering to ~37 kW at that point.
I didn't bother w/having it email me a receipt for my free charges as I'd would've needed to type it on on their touch screen.
In their app, under Account > Charge history, it might also say. It is empty for me since I didn't use the app for free sessions and they don't display very old sessions.