How does Pinduoduo automatically deduct fees?

This is because you opened the automatic deduction, and you were not careful when browsing.

Step 1 Open the mobile phone WeChat, click Me in the lower right corner, and select the payment option.

Step 2: Click the fee deduction service, click the three-point icon of payment management, and select the fee deduction service.

Step 3: Select the confidential payment option to enter the page, and then click the confidential payment for Pinduoduo order.

Step 4: Close the fee deduction service and enter the page. Click to close the fee deduction service, and click OK to close the fee deduction service.