Say my user has a 4 month subscription. One month within it, she wants to move to a yearly subscription. How does google play in-app billing handle this? Is there a method to move user from one subscription into another? I am considering the real effects of possibly billing errors such as overcharging a user, etc. The idea of charging the user only 1/4th of the 4-month subscription and then canceling it and then starting the yearly version. Does in-app billing handle these issues?
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