How can I ensure that my billing address is different from my delivery address?

If your order is being sent to France, add the billing address you wish to use at step "3. DELIVERY" during checkout by unchecking "My billing and shipping addresses are the same".

You can also register new addresses in your customer space, via the "My address book" tab. These can be used in the future as delivery or billing addresses.

If your order is being sent to another country, and you wish to enter a different billing address from your delivery address, proceed as follows:

Select the version of the site corresponding to the country of delivery;
Go to the checkout;
Enter your billing address;
Select "Add another delivery address";
Enter the delivery address you require.