When you are ready to check out, you can Select WeChat Pay from the list of payment options.
NOTE: Paying with WeChat is the most secure, and easiest option. You can view https://www.pandaboo.cn/how-to-setup-wechat-pay for instructions on how to setup WeChat Pay.
After you have selected the WeChat pay option you can scroll down to the check out page then click on "Confirm & Pay". It will then redirect you to the WeChat APP to pay for your order.