Not supposed to use mobile phones in petrol stations then they develop a pay app. Crazy!TBH I've only used it a few times, because one of those times the app must have crashed during the process and I drove off thinking it was all fine - once you've scanned the QR code it tells you to leave your phone in the car, fill up and then F off. Which I did.
Then when I got home I realised there'd been a glitch and panicked for a few days thinking I'd done a drive-away! Until it finally appeared on my PayPal account, and I vowed to use cash in the future