Prepaid Virtual Credit Cards Cardholders can sign up for the free program at their credit card company's website. When they want to make an online purchase, they receive a 16-digit number, randomly generated by the credit card company. This temporary credit card number can be used once or sometimes repeatedly at the same online store.virtual prepaid credit card numbers were initially designed for Internet shopping, but can be...... Similar Editorial : Prepaid Credit Cards by Jagan babu vasudevan. | Source : Credit Card Debt Loans