from alipay import AliPay
    
    # paid via WAP or iOS/Android
    alipay = AliPay(
      appid="",
      app_notify_url="", 
      app_private_key_path="", 
      app_alipay_public_key_path="",  # public key which belongs to alipay, this is used to validate messages sent from alipay server.
      sign_type="RSA" # RSA or  RSA2
    )
    
    # paid via Web
    alipay = AliPay(
      partner="",
      web_notify_url="", 
      web_private_key_path="", 
      web_alipay_public_key_path=""  # public key which belongs to alipay, this is used to validate messages sent from alipay server.
    )
    
    # Intialize alipay in this way if you want to handling all the paying methods mentioned,  
    alipay = AliPay(
      appid="",
      app_notify_url="", 
      app_private_key_path="",
      app_alipay_public_key_path="",
      partner="", 
      web_notify_url="",
      web_private_key_path="", 
      web_alipay_public_key_path="" 
    )

    # if you are using Python 2(you should really think about Python 3), making sure non-ascii strings are utf-8 encoded
    subject = u"测试订单".encode("utf8")
    # if you are Python3 user, just use the default string
    subject = "测试订单"

    # paid via App，just generating order_string and pass it to your mobile app
    order_string = alipay.create_app_trade(out_trade_no="20161112", total_amount=0.01, subject="testing order")
    # paid via WAP, open this url in your browser: https://openapi.alipay.com/gateway.do? + order_string
    order_string = alipay.create_wap_trade(out_trade_no="20161112", total_amount=0.01, subject="testing order", return_url="https://example.com")
    # paid via Web，open this url in your browser: https://mapi.alipay.com/gateway.do? + order_string
    order_string = alipay.create_web_trade(out_trade_no="20161112", total_amount=0.01, subject="testing order", return_url="https://example.com")

import json
from flask import Flask
from flask import request
app = Flask(__name__)

@app.route('/', methods=["GET", "POST"])
def hello_world():
    data = request.form.to_dict()
    signature = data.pop("sign")

    print(json.dumps(data))
    print(signature)

    # verify 
    alipay.verify_wap/web/app_notify(data, signature)
    return 'Hello, World!'

    # gathering all parameters sent from alipay server, and put them in a dictionary called data
    data = {
          "subject": "testing order",
          "gmt_payment": "2016-11-16 11:42:19",
          "charset": "utf-8",
          "seller_id": "xxxx",
          "trade_status": "TRADE_SUCCESS",
          "buyer_id": "xxxx",
          "auth_app_id": "xxxx",
          "buyer_pay_amount": "0.01",
          "version": "1.0",
          "gmt_create": "2016-11-16 11:42:18",
          "trade_no": "xxxx",
          "fund_bill_list": "[{\"amount\":\"0.01\",\"fundChannel\":\"ALIPAYACCOUNT\"}]",
          "app_id": "xxxx",
          "notify_time": "2016-11-16 11:42:19",
          "point_amount": "0.00",
          "total_amount": "0.01",
          "notify_type": "trade_status_sync",
          "out_trade_no": "xxxx",
          "buyer_logon_id": "xxxx",
          "notify_id": "xxxx",
          "seller_email": "xxxx",
          "receipt_amount": "0.01",
          "invoice_amount": "0.01",
          "sign": "xxx"
        }
    signature = data.pop("sign")
    # Verification for App
    success = alipay.verify_app_notify(data, signature)
    # Verification for WAP
    success = alipay.verify_wap_notify(data, signature)
    # Verification for Web
    success = alipay.verify_web_notify(data, signature)
    if success and (data["trade_status"] == "TRADE_SUCCESS" or data["trade_status"] == "TRADE_FINISHED" ):
        print("trade succeed")

# Example for refund
result = alipay.refund_web_order(out_trade_no="xxx", refund_amount="xxx", ...)
result = alipay.refund_app_order(out_trade_no="xxx", refund_amount="xxx", ...)
result = alipay.refund_wap_order(out_trade_no="xxx", refund_amount="xxx", ...)

if result["code"] == "10000":
    print("success")

alipay = AliPay(appid="", ...)

result = alipay.create_face_to_face_trade(
    "out_trade_no", "bar_code/wave_code", "auth_code", "subject",
    discountable_amount=10,
    total_amount=20,
    # you may input more parameters here, refer to alipay official doc for details
    )

if  result["code"] == "10000":
    print("Order is paid")

alipay = AliPay(appid="", ...)

# create an order
result1 = alipay.precreate_face_to_face_trade(
    "out_trade_no", 100, "test subject"
    # you may input more parameters here, refer to alipay official doc for details
)

# check order status
paid = False
for i in range(10):
    # check every 3s, and 10 times in all
    print("now sleep 3s")
    time.sleep(3)
    result = alipay.query_face_to_face_trade(out_trade_no="out_trade_no24")
    if result.get("trade_status", "") == "TRADE_SUCCESS":
        paid = True
        break
    print("not paid...")

# order is not paid in 30s , cancel this order
if paid is False:
    alipay.cancel_face_to_face_trade(out_trade_no=out_trade_no)