The black card holder logs on to his or her personal space or to the application, heading My cards > Manage my cards. Then click on the Parental Control button. You can then activate or deactivate contactless payment, block certain merchants forbidden to under-18s, authorize or disallow ATM withdrawals, and remotely lock or unlock the red card. You can also make a request to Customer Service, by telephone on 01 53 88 22 76 (Free call) or from your personal space in the "Contact us" section.