How to pay an order with your subscription

Thank you very much, I wanted to inquire if it was possible, and thank you very much to you.

hello
it's possible but not for all sites
and you need to subscribe to the option

Purchasing services online
With Free's partner, Internet+, benefit from a secure, simple, and reliable payment solution for your online purchases (music, games, ringtones, ....) on all sites where you see the Internet+ logo.

These are directly charged to your next Free bill without fees or commissions and without any personal or banking information being required.
see in your subscriber space->
My Internet+ account
Access your Internet+ account
Find the directory of available services
Review the specific conditions
Unsubscribe from an Internet+ service
User space
but be careful you must be the account holder and the one who pays for it (not your parents for example if you are a minor)