Credit card installment third-party certification refers to the documents or supporting materials related to the installment transaction that need to be provided when making a credit card installment payment. These certification documents are usually used to verify personal identity information, income and loan repayment ability to ensure the legality and safety of installment transactions.

The following are some examples of third-party proof of credit card installments that may be required:

1. **Personal identity proof**: such as valid ID card, passport, etc., for Confirm the borrower’s identity information.

2. **Proof of income**: It can be salary slips, bank statements, tax forms and other related documents, used to prove the borrower's financial ability and repayment ability.

3. **Employment certificate**: Such as employment contract, labor contract, social security payment certificate, etc., used to prove the borrower's working status and stability.

4. **Bank statement**: used to display the borrower's transaction records and capital flow to evaluate its repayment ability.

5. **Other credit certificates**: such as credit reports, past loan records, etc., used to evaluate the borrower's credit status and timely repayment.

The specific requirements may vary depending on the regulations of different banks and regions. Therefore, when applying for credit card installment payment, it is recommended that you contact the credit card issuing bank or third-party institution to understand their specific requirements and provide corresponding supporting materials.