1. Open Pinduoduo App and log in.

2. Click on the "My" page.

3. Click the Account and Security option.

4. On the Account and Security page, find the Payment Settings option, and then click Enter.

5. On the "Payment Settings" page, find the "My Bank Card" option and click Enter.

6. On the "My Bank Card" page, find the deducted bank card and delete or replace it. If you are not sure which bank card to deduct, I suggest you contact your bank to check the running record of the bank card to help you find the bank card to deduct. If you can't cancel the bank card deduction authority, I suggest you contact Pinduoduo Customer Service for more help and solutions.