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Hi. You need to connect events to your own functions on OnEnable and remove them OnDisable.

private void OnEnable()
{
    WMBroadcaster.OnMonetizationStart += OnMonetizationStart;
    WMBroadcaster.OnMonetizationProgress += OnMonetizationProgress;
}
    
private void OnDisable()
{
    WMBroadcaster.OnMonetizationStart -= OnMonetizationStart;
    WMBroadcaster.OnMonetizationProgress -= OnMonetizationProgress;
}

In this code. right right side of operators are your own private methods.

https://learn.unity.com/tutorial/events-uh see here for more info about delegates and events.