I find the same behavior in my application. In our case, we do not use Adyen. But the behavior is the same.
Each time the application returns to the forefront after some time, it loses its status and restarts to its original state.
I have not found a way to avoid this behavior. Is there a way to get SFSafariViewController to keep its state?
UPDATE: I found that this behavior only happens in iOS 10.0.1
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