In fact I solved the problem by connecting with my "main" PC. For some reasons, it does not work the first time you attempt to make a payment from a secondary host (PC, smartphone, tablet, smart TV, console...). If you get this error on one device (even if that device is authenticated in your Google and Paypal accounts), you'll need to retry the same request from another device. The error [OR-CPIT-06] (from PayPal) is not documented enough and the error 201 you get (from Google Play) is not documented as well. The given "help link" does not show what you can do. There are some cases where the two services do not use the same expected methods and the link between services does not work (may be it worked in the past, but there are new security restrictions implemented by services or by browsers that cause the old assumptions to fail: this worked using *unsecure* session cookies via side channels, which do not respect the CORS restrictions). Google Play and PayPal should find together a working solution that implements the most secure options available on both services and working with common browsers (for now it does not work with Android clients, even the latest up to date version of Google Play for Android Nougat/Oreo/Pie), and bugs occuring frequently after major OS updates on Windows, or in Chrome/Edge/IE/Firefox browsers applying the newest security restrictions (sometimes enforced by security tools like antivirus if they are still not implemented in the OS or browser, or in private local proxies).
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