Google has just added a new feature to AdWords. This feature is My Client Center which will now allow you to configure email alerts. Hence if you want to be notified of when an ad delivery is stopped, or if your credit card was declined, or if a cmapaign is near ending, or if an account budget is almost done, or if your budget is 80% empty, you can get all these alerts prompted to you via email.
According to the AdWords help center, based on your preference settings, alerts will appear on your My Client Center (MCC) dashboard about account-specific issues such as stopped ad delivery, credit card declines and the approach of campaign and budget end-dates.