django--- 支付宝退款

from datetime import datetime
from Crypto.PublicKey import RSA
from Crypto.Signature import PKCS1_v1_5
from Crypto.Hash import SHA256
from urllib.parse import quote_plus
from urllib.parse import urlparse, parse_qs
from base64 import decodebytes, encodebytes
import json
import requests

class AliPay(object):
    """
    支付宝支付接口(PC端支付接口)
    """

    def __init__(self, appid, app_notify_url, app_private_key_path,
                 alipay_public_key_path, return_url, debug=False):
        self.appid = appid
        self.app_notify_url = app_notify_url
        self.app_private_key_path = app_private_key_path
        self.app_private_key = None
        self.return_url = return_url
        with open(self.app_private_key_path) as fp:
            self.app_private_key = RSA.importKey(fp.read())
        self.alipay_public_key_path = alipay_public_key_path
        with open(self.alipay_public_key_path) as fp:
            self.alipay_public_key = RSA.importKey(fp.read())

        if debug is True:
            self.__gateway = "https://openapi.alipaydev.com/gateway.do"
        else:
            self.__gateway = "https://openapi.alipay.com/gateway.do"

    def direct_pay(self, subject, out_trade_no, total_amount, return_url=None, **kwargs):
        biz_content = {
            "subject": subject,
            "out_trade_no": out_trade_no,
            "total_amount": total_amount,
            "product_code": "FAST_INSTANT_TRADE_PAY",
            # "qr_pay_mode":4
        }

        biz_content.update(kwargs)
        data = self.build_body("alipay.trade.page.pay", biz_content, self.return_url)
        return self.sign_data(data)

    def build_body(self, method, biz_content, return_url=None):
        data = {
            "app_id": self.appid,
            "method": method,
            "charset": "utf-8",
            "sign_type": "RSA2",
            "timestamp": datetime.now().strftime("%Y-%m-%d %H:%M:%S"),
            "version": "1.0",
            "biz_content": biz_content
        }

        if return_url is not None:
            data["notify_url"] = self.app_notify_url
            data["return_url"] = self.return_url

        return data

    def sign_data(self, data):
        data.pop("sign", None)
        # 排序后的字符串
        unsigned_items = self.ordered_data(data)
        unsigned_string = "&".join("{0}={1}".format(k, v) for k, v in unsigned_items)
        sign = self.sign(unsigned_string.encode("utf-8"))
        # ordered_items = self.ordered_data(data)
        quoted_string = "&".join("{0}={1}".format(k, quote_plus(v)) for k, v in unsigned_items)

        # 获得最终的订单信息字符串
        signed_string = quoted_string + "&sign=" + quote_plus(sign)
        return signed_string

    def ordered_data(self, data):
        complex_keys = []
        for key, value in data.items():
            if isinstance(value, dict):
                complex_keys.append(key)

        # 将字典类型的数据dump出来
        for key in complex_keys:
            data[key] = json.dumps(data[key], separators=(',', ':'))

        return sorted([(k, v) for k, v in data.items()])

    def sign(self, unsigned_string):
        # 开始计算签名
        key = self.app_private_key
        signer = PKCS1_v1_5.new(key)
        signature = signer.sign(SHA256.new(unsigned_string))
        # base64 编码，转换为unicode表示并移除回车
        sign = encodebytes(signature).decode("utf8").replace("
", "")
        return sign

    def _verify(self, raw_content, signature):
        # 开始计算签名
        key = self.alipay_public_key
        signer = PKCS1_v1_5.new(key)
        digest = SHA256.new()
        digest.update(raw_content.encode("utf8"))
        if signer.verify(digest, decodebytes(signature.encode("utf8"))):
            return True
        return False

    def verify(self, data, signature):
        if "sign_type" in data:
            sign_type = data.pop("sign_type")
        # 排序后的字符串
        unsigned_items = self.ordered_data(data)
        message = "&".join(u"{}={}".format(k, v) for k, v in unsigned_items)
        return self._verify(message, signature)


    #请求支付宝退款接口
    def api_alipay_trade_refund(self, refund_amount, out_trade_no=None, trade_no=None, **kwargs):
            biz_content = {
                "refund_amount": refund_amount
            }
            biz_content.update(**kwargs)
            if out_trade_no:
                biz_content["out_trade_no"] = out_trade_no
            if trade_no:
                biz_content["trade_no"] = trade_no
            data = self.build_body("alipay.trade.refund", biz_content)
            url = self.__gateway + "?" + self.sign_data(data)
            r = requests.get(url)
            html = r.content.decode("utf-8")
            return html

这个是pay.py 文件  这个工具类

然后导入这个工具类

#支付方法
from .pay import AliPay


#第三方支付
def get_ali_object():
    # 沙箱环境地址：https://openhome.alipay.com/platform/appDaily.htm?tab=info
    app_id = "2016092500595776"  #  APPID （沙箱应用）

    # 支付完成后，支付偷偷向这里地址发送一个post请求，识别公网IP,如果是 192.168.20.13局域网IP ,支付宝找不到，def page2() 接收不到这个请求
    notify_url = "http://localhost:8000/md_admin/alipayreturn"

    # 支付完成后，跳转的地址。
    return_url = "http://localhost:8080/user_center_order.html"

    merchant_private_key_path = "C:/Users/dell/www/md/keys/alipay_private_2048.txt.txt" # 应用私钥
    alipay_public_key_path = "C:/Users/dell/www/md/keys/alipay_public_2048.txt"  # 支付宝公钥

    alipay = AliPay(
        appid=app_id,
        app_notify_url=notify_url,
        return_url=return_url,
        app_private_key_path=merchant_private_key_path,
        alipay_public_key_path=alipay_public_key_path,  # 支付宝的公钥，验证支付宝回传消息使用，不是你自己的公钥
        debug=True,  # 默认False,
    )
    return alipay





def alipay_return(request):
    alipay = get_ali_object()
    params = request.GET.dict()
    sign = params.pop('sign', None)
    status = alipay.verify(params, sign)
    print('==================开始==================')
    print('GET验证', status)
    print('==================结束==================')
    return HttpResponse('支付成功')



#退款
class Refund(APIView):

    def post(self,request):

        # 根据当前用户的配置，生成URL，并跳转。
        money = float(request.POST.get('price'))

        orderno = request.POST.get('orderno')


        #实例化支付类
        alipay = get_ali_object()
        #调用退款方法
        order_string = alipay.api_alipay_trade_refund(
        #订单号，一定要注意，这是支付成功后返回的唯一订单号
        out_trade_no=str(orderno),
        #退款金额，注意精确到分，不要超过订单支付总金额
        refund_amount=money,
        #回调网址
        notify_url='http://localhost:8000/md_admin/alipayreturn'
        )
        return HttpResponse(order_string)

# 支付
class Page(APIView):



    def post(self,request):



        # 根据当前用户的配置，生成URL，并跳转。
        money = float(request.POST.get('price'))
        print("金钱",money)
        orderno = request.POST.get('orderno')
        print("订单",orderno)



        alipay = get_ali_object()
        # 生成支付的url
        query_params = alipay.direct_pay(
            subject="test",  # 商品简单描述
            out_trade_no = str(orderno),  # 用户购买的商品订单号（每次不一样） 20180301073422891
            total_amount=money,  # 交易金额(单位: 元 保留俩位小数)
        )
        pay_url = "https://openapi.alipaydev.com/gateway.do?{0}".format(query_params)  # 支付宝网关地址（沙箱应用）



        # 获取订单id
        id = request.POST.get("id")



        #改变支付状态，以及支付时间
        res = Orders.objects.filter(id=int(id)).update(orderstate=1,paytime=datetime.datetime.now())



        data = {'name':pay_url}
        return Response(data)

这个就是退款  在我前面的文档中有支付的详细介绍

就是这样啦~~~~