Is it safe to keep the card number on file?

Answer

It is safe to maintain a card account number on file as there are zero dollars on the card until an invoice is approved for payment. Once an invoice is approved for payment, the card will be funded for the exact amount of the invoice(s) and you will receive a remittance advice. The remittance advice is an electronic confirmation that the card is ready to be charged. This technology eliminates risk associated with maintaining the card account number on file

Summary

It is safe to maintain a card account number on file as there are zero dollars on the card until an invoice is approved for payment