paySig = to_hex(hmac_sha256(appKey,method + '&' + signData))

  import hmac
  import hashlib
  import urllib.parse

  # sign_data: The original payment string. Note that sign_data must be exactly the same as the parameters sent from the frontend, including spaces and line breaks. It is recommended to generate and send it from the backend.
  # appKey
  # method
  def gen_pay_sig(sign_data, appkey, method):
      need_encode_body = method + '&' + sign_data
      print(need_encode_body)
      return hmac.new(key=appkey.encode('utf-8'), msg=need_encode_body.encode('utf-8'),
              digestmod=hashlib.sha256).hexdigest()

pay_event_sig = to_hex(hmac_sha256(app_key, event + '&' + payload))


#!/usr/bin/python
# -*- coding: utf-8 -*-
""" Example of PayEventSig signature calculation algorithm """
 
import hmac
import hashlib
 
 
def calc_pay_event_sig(event, payload, app_key):
    """ pay_event_sig signature algorithm
      Args:
          event - event type, e.g., pass event when creating an order
          payload - data corresponding to the event, such as the payload in the notification message,
                      e.g. {"OpenId":"to_user_openid","OutTradeNo":"xxxxxxx","WeChatPayInfo":{"MchOrderNo":"xxxxxxx","TransactionId":"xxxxxxx"},"Env":0,"CoinInfo":{"ZoneId":"1","TotalPrice":100,"BuyQuantity":1,"OrigPrice":100}}
          app_key - virtual payment key configured by superapp
      Returns:
          Payment request signature pay_event_sig
    """
    need_sign_msg = event + '&' + payload
    pay_sig = hmac.new(key=appkey.encode('utf-8'), msg=need_sign_msg.encode('utf-8'),
                       digestmod=hashlib.sha256).hexdigest()
    return pay_sig