How can I insure there are adequate funds for creating USPS labels?
On your Endicia account page you can enable the auto-funding so you can stay ahead of your postage needs.
First, login to your Endicia account.
Next, select the Balance menu option and navigate to Buy More.
Select the Auto-fund account option
Enter the dollar amount and minimum balance for purchase
Close the dialogs and you're all set to auto-purchase!