For example, you want to know if your CC has money for your 600$ order. 
 
- You go to a website and choose a random product that costs 600$. 
- Procceed to checkout, enter all CC details and a -FAKE- billing. 
- Continue and finish the order. 
 
If it will give you a message "Your card has been declined" your card has not enough balance for the order. 
 
If it gives you a message "AVS missmatch" or something familiar, then your card has enough balance. 
 
Goodluck!
                 
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