Yes, i do this for some my apps.
But posted here just wondering that no post about this problem yet.
Seems, Google was doing something, but again forums show that this cracking app is still working with a patched Play Market version.
So, i just meant for the community -be warned, the paid in-app payment Android apps are more and more not interesting to publish only basing on Google services...
Seems, serious paid apps are to be tied to another server also...