When setting up the payment options for a new app, you will have the possibility of selecting a “soft limit”.
By setting it up this way, the payment for that subscription will go through regardless of whether it is within the budget or it exceeds it.
Do note that there must be enough funds available in your main account for the payment to take place.
This option is great for critical subscriptions.
Let’s say that if the payment for Amazon Web Services is declined your website won’t work. That would be a huge inconvenience, wouldn’t it?
If for some reason for one billing cycle you are charged twice the amount you have forecasted, the payment will still go through with a soft budget.