Don’t worry if your credit card was deducted 1 yuan from iTunes. For credit cards, the App Store will refer to the practices of foreign card organizations VISA and MasterCard and send you the UnionPay card number, CVN2 (security code), After the validity period (expiration date) and mobile phone number, call the UnionPay pre-authorized transaction interface to implement a pre-authorized transaction of 1 RMB. After the UnionPay card is successfully associated, the merchant will immediately initiate a pre-authorization revocation transaction to unfreeze the 1 RMB Pre-authorized transactions.