When using the WeChat payment method of "Siyuan Code" for consumption, if the balance of the deduction account set by WeChat is insufficient, it supports one offline consumption, but the actual deduction is not successful. Under such circumstance, you will receive a notice of overdue payment, displayed below the Siyuan QR code. Please click on the overdue payment notification. After completing the overdue payment, the "Siyuan Code" will resume normal use.