1. In the Fuding Big White Tea Big Data Chao Yuan System, enter the system management interface, and select the module that needs to be modified in terms of payment method, such as the order management module.

2. In the order management module, find the payment setting option and enter the payment setting page.

3. In the Payment Settings page, find the payment method that needs to be modified, such as WeChat Pay, and disable or delete it. Then add the cash payment method, set the relevant payment parameters and save.

4. Save and test the payment function to ensure that cash payment has been successfully enabled.