Google Play Billing Library Question/Issue

As part of testing a new mobile app of mine, I noticed that the Google Play Billing Library screen is always coming up in a portrait orientation regardless of the orientation of the cell phone. The problem is that if the cell phone is in a landscape orientation and you still complete a purchase then the entire app crashes as it orients back to landscape mode and acts as if the purchase never happened.

I tried locking the app in a portrait orientation, but that doesn't work for all cell phones.

Is there a way to force the Google Play Billing Library screen's orientation to match the cell phone's orientation ?