The app needs to check whether I bought the Plus edition via Google in-app purchases (IAPs) because that's what the developer uses to accept payments. I did not

The app needs to check whether I bought the Plus edition via Google in-app purchases (IAPs) because that's what the developer uses to accept payments. I did not¹ so there is nothing to be billed, but it does the license check of course. As I understand the developer's response, my being kicked into the Play Store and being told to sign in, with no way of using the app until I've done so, is apparently Google's new requirement for using Google's IAP mechanism at all ¹ I'd love to pay for my use, but rather by something like liberapay or just IBAN transfer, so the developer gets 100% of the money and I don't have to give banking information to Google. With my email to the developer, I also asked for an IBAN in case they can accept payment in that way, as I now had to pirate the apk to use it while signed out of Google, but haven't gotten a response to that yet.