In app billing manager.RequestPayment authentication

Hi all,

I try to use In-App billing v3. When I call manager.RequestPayment there is an error message from Google:

Authentication Required. You have to sign in to your Google Account .

Shall I sign in from my app? If yes how to do?

Need your help
Lutz

from B4X Community - Android, iOS, desktop, server and IoT programming tools http://ift.tt/21J9phD
via IFTTT