I have encountered this problem, so I will. It may be that the balance of WeChat is insufficient. I put the specific methods and processes below, hoping to help you.

Tools/raw materials

Huawei glory 8X

Harmonious world

Pinduoduo 6.43.0

1. First open Pinduoduo, enter the home page, and select the order to be traded.

2. Choose 0 yuan in the lower right corner to try it on, and pay first before using it.

3. After selecting the product, change the payment method.

4. Select WeChat Pay and enter the correct WeChat password.