The blue e-card, the most widespread

A virtual blue card to subscribe to its bank (between 0 and 50 € / year) and that one activates on the site of it. It is then sufficient to return to each transaction to obtain an ephemeral number valid for a single purchase. The total amount is debited to the current account.
Most ? As this blue e-card is attached to our classic bank card, we benefit from the same guarantees and assurances. Practical when buying a plane or train ticket via the internet.
The downside: Unusable when you have a purchase for which you have to present your credit card at the time of delivery.

Prepaid tickets, real gift vouchers

Pre-paid cards or tickets of 10, 25, 50 or 100 € are available for purchase from the selected partner. For example Premium Tickets are valid on some 300 brands of the net (Etam, 3 Swiss ...). Each cut has an 11 or 16 digit code replacing that of the credit card at the time of payment.
Most ? The balance of card or ticket can be transferred to another.
The downside: the partner sites are not very numerous .

Internet , for micro-purchases

This service is offered by the telephone operators (Orange, Bouygues, SFR, Free and Alice). It allows from its mobile or box TV to regulate digital contents (music, ringtone, games ...) without card. Provided not to exceed 30 €. Simply click on the "Internet " logo and the amount is added to the monthly invoice.
Most ? No need to register or create an account.
The flat : the perimeter of purchase is very limited.