title: Will stripe.customers.createBalanceTransaction charge customer's credit card?
body: <p>I am trying to create a workaround to make sure the customer has sufficient funds before to upgrade him to another tier. I am using <code>stripe.customers.createBalanceTransaction</code> in development mode but I am not sure how it will behave in a production environment. Does it charges the customer's credit card to add funds ?</p>
  <p>If not, how can I manage to make the customer pay before upgrade him to the upper tier ?</p>