App store debit card purchasing I purchased an app on app store using my VISA debit card, the app cost is 1.88 dollars. my fund in my debit card is only 1 dollar, the purchase was completed/succesfull, how could that be possible? and what would happen next? will apple collect the amount when I added fund to my debit card?

EDIT:

in my purchase history, there is a message says We were unable to authorize your payment card for this purchase. Please update billing info. there is also a message like:


  Amount you owe is 1.88 USD


Thanks!
You may have overdrawn/gone into your overdraft. If your card does not have an overdraft facility, be careful, the amount of money you overdrew can get charged horrifically (at least it does here in the UK). 

Not sure what Apple policies are or the time they allow to fully pay if off if they haven't collected the full money though. 

Hope this helps!