Sorry, that would not be actionable. Please provide more information, as requested. I’ve viewed some of your other posts and I understand that you are a bit frustrated, sorry about that. But to address your issue, we would need more information. What device are you seeing this error, Android or iOS? Did the links I shared look to be relevant?
Understood. Unfortunately there is no immediate action we can take with this information. Perhaps if someone else sees this thread and has the issue, they can provide more information and steps to reproduce. In the meantime, you might want to compare your code to the Sample IAP Project, which is working with 4.5.0 for me. The device logs may provide more information too. Does this phone have the Google Play Store installed? You might also try with a non-Xiaomi device too https://discussions.unity.com/t/700293/6 and https://discussions.unity.com/t/699654