I can't see where the library access this info if at all.
So far I just check as follows but not sure if subscription is canceled I will know.
B4X:
Sub SubManager_OwnedProducts (Success As Boolean, purchases As Map)
' Log(Success)
If Success Then
Log(purchases)
For Each p As Purchase In purchases.Values
If p.ProductId = "laraplus" Then
subs = True
Else
subs = False
End If
Next
End If
End Sub