Bring your ID card and bank card, go to the bank to accept the application, explain to the bank staff the purpose of issuing a settlement certificate, and the bank staff will handle it for you.
If you have applied for many credit cards, it will be more straightforward to bring your personal ID card to the local Credit Reference Center of the People's Bank of China or check and print your credit report on its official website. The credit report is a more comprehensive list of various conditions of credit card use, which is more convincing.
If you have really paid off your credit card bill and did not overdue it maliciously, the bank will easily issue you a credit card repayment certificate, so you don’t have to worry too much.