The credit card guarantor did not know, and his signature is as follows: 1. If the parties conclude a contract in the form of a contract, the contract is established when both parties sign or seal it; 2. If the guarantor fails to sign a guarantee contract or a loan contract, the guarantor shall not be liable. When the guarantee is a general guarantee, the guarantor has the right of first appeal, that is, the guarantor has the right to refuse the creditor's repayment request before the creditor applies to enforce the debtor's property or fails to enforce the security interest. Co-guarantors have no such right.

Measures for the supervision and administration of credit card business of commercial banks Article 38 The card-issuing bank shall publicly and clearly inform the applicant of the application materials and basic requirements, and the application materials must be signed by the applicant himself, and the card shall not be issued without the knowledge of the customer or against the will of the customer. The application materials for the supplementary card of the credit card accepted by the issuing bank must be confirmed by the main cardholder through personal signature, customer service telephone recording, electronic signature or a way recognized by both the cardholder and the issuing bank. Article 682 of the Civil Code of People's Republic of China (PRC) guarantees that this contract is a subsidiary contract of the principal creditor's rights and debts contract. If the principal creditor's rights and debts contract is invalid, the guarantee contract is invalid, unless otherwise stipulated by law. Article 685 A suretyship contract may be a separate written contract or a suretyship clause in the principal creditor's rights and debts contract. The forms of suretyship include general suretyship and joint liability suretyship. If the parties have not agreed on the way of guarantee or the agreement is unclear in the guarantee contract, they shall bear the guarantee liability according to the general guarantee.