Legal basis: According to Article 6 of the Credit Card Charter of China Guangfa Bank, any natural person (the principal cardholder must be at least 18 years old) who has full capacity for civil conduct, a legal and stable source of income and a good credit standing can apply to the card issuer for a personal card with his/her valid identity certificate and relevant materials recognized by the card issuer. The main card (only card products that can handle supplementary cards) can also handle no more than 4 supplementary cards for specific natural persons with full capacity for civil conduct or limited capacity for civil conduct (the holder of the main platinum card can only handle no more than 1 supplementary card). The main cardholder can apply for cancellation of the supplementary card or stop using the supplementary card at any time. Card issuers implement multi-account management for credit cards, and all credit cards (including main card and supplementary card) under the name of the cardholder belong to the same cardholder account. The cardholder of the secondary card shares the same credit line with the cardholder of the primary card, and all the transaction funds of the secondary card and the corresponding interest, expenses and liquidated damages are all credited to the account of the primary card. The supplementary cardholder with full capacity for civil conduct and the main cardholder shall be jointly and severally liable for the debts incurred under the main card and the supplementary card.