How to transmit order numbers to Dinpay, and how to configure parameters?

Every shopping site has its own order number, which can be transmitted to Dinpay using the parameter order_no on the Dinpay API, for the purpose of auditing. order_no must be a variable, not a constant. For example, order_no = dingdan, and not order_no = “dingdan” (same applies for other parameters)