很多网站里都有金币、积分之类的虚拟货币，获取这些往往需要充值。那么问题来了，如何在Django中对接支付宝实现支付宝充值金币的功能呢？网上很多资料都是电商的，那些都会带有订单系统之类比较复杂，而充值金币功能不需要实现那么多功能。

效果图如下：

现在就来实现Django对接支付宝支付功能吧！

登录支付宝开放平台

点击进入蚂蚁金服开放平台https://open.alipay.com/platform/home.htm
进入支付宝沙箱环境https://openhome.alipay.com/platform/appDaily.htm?tab=info

如图，这里是你沙箱环境的配置，左侧沙箱工具有沙箱支付宝安卓版下载，沙箱账号是你的测试账号。

下载支付宝开放平台开发助手

点击打开下载链接

打开工具，生成密钥，然后妥善保管好！！

保存密钥

把刚刚那个应用公钥2048重命名为：pub_2048.txt，把应用私钥2048重命名为：private_2048.txt，把这两个文件放在项目目录下。
注意：密钥的开始和结束一定要加上如下的字符串！！！

-----BEGIN PRIVATE KEY-----
这里粘贴里面的密钥
-----END PRIVATE KEY-----

复制支付宝的公钥并保存

把这段支付宝公钥复制，重命名为alipay_key_2048.txt，保存到项目目录中，注意加上如下字符串

-----BEGIN PRIVATE KEY-----
这里粘贴里面的密钥
-----END PRIVATE KEY-----

设置公钥

把刚刚的pub_2048.txt里面的字符串复制到如下：

调试支付宝支付接口

from datetime import datetimefrom Crypto.PublicKey import RSA
from Crypto.Signature import PKCS1_v1_5
from Crypto.Hash import SHA256
from urllib.parse import quote_plus
from base64 import decodebytes, encodebytesimport jsonclass AliPay(object):"""支付宝支付接口"""def __init__(self, appid, app_notify_url, app_private_key_path,alipay_public_key_path, return_url, debug=False):self.appid = appidself.app_notify_url = app_notify_urlself.app_private_key_path = app_private_key_pathself.app_private_key = Noneself.return_url = return_urlwith open(self.app_private_key_path) as fp:self.app_private_key = RSA.importKey(fp.read())self.alipay_public_key_path = alipay_public_key_pathwith open(self.alipay_public_key_path) as fp:self.alipay_public_key = RSA.import_key(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_urldata["return_url"] = self.return_urlreturn datadef 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_stringdef 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_keysigner = 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("\n", "")return signdef _verify(self, raw_content, signature):# 开始计算签名key = self.alipay_public_keysigner = PKCS1_v1_5.new(key)digest = SHA256.new()digest.update(raw_content.encode("utf8"))if signer.verify(digest, decodebytes(signature.encode("utf8"))):return Truereturn Falsedef 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)def get_alipay_url(app_id, order_sn, order_mount):alipay = AliPay(appid=app_id,app_notify_url="http://127.0.0.1:8000/alipay/return/",app_private_key_path="../trade/keys/private_2048.txt",alipay_public_key_path="../trade/keys/alipay_key_2048.txt",  # 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_url="http://127.0.0.1:8000/alipay/return/")url = alipay.direct_pay(subject=order_sn,out_trade_no=order_sn,total_amount=order_mount,)re_url = "https://openapi.alipaydev.com/gateway.do?{data}".format(data=url)return re_urlif __name__ == "__main__":url = get_alipay_url('2016092600597838','201902923423436',1.00)print(url)

如果输出的url能够打开并且使用沙箱账号支付，说明前面的配置成功了，可以进行视图的编写。

设计数据库订单模型

from django.db import models
from django.conf import settings
from django.utils.encoding import python_2_unicode_compatiblefrom questioning.utils.models import CreatedUpdatedMixin@python_2_unicode_compatible
class OrderInfo(CreatedUpdatedMixin, models.Model):'''充值订单详情'''ORDER_STATUS = (('TRADE_SUCCESS', '交易支付成功'),('TRADE_CLOSED', '未付款交易超时关闭'),('WAIT_BUYER_PAY', '交易创建'),('TRADE_FINISHED', '交易结束'),('paying', '待支付'),
)user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, verbose_name='用户')order_sn = models.CharField(max_length=30, null=True, blank=True, unique=True, verbose_name='订单号')trade_no = models.CharField(max_length=100, unique=True, null=True, blank=True, verbose_name='支付订单号')pay_status = models.CharField(choices=ORDER_STATUS, max_length=40, verbose_name='订单状态', default='paying')order_mount = models.DecimalField(verbose_name="充值金额", max_digits=10,decimal_places=2, default=0.00)class Meta:verbose_name = "充值订单"verbose_name_plural = verbose_namedef __str__(self):return self.order_sn

注意充值的金额要设置为models.DecimalField货币类型
然后导入到数据库中

视图函数编写

class AlipayView(LoginRequiredMixin, AuthorRequiredMixin, View):"""支付宝支付get方法实现支付宝return_url，如果没有实现也无所谓，post同样可以更新状态post方法实现支付宝notify_url，异步更新支付宝返回的url如下：#http://127.0.0.1:8000/alipay/return/?# charset=utf-8&# out_trade_no=201902923423436&# method=alipay.trade.page.pay.return&# total_amount=1.00&# sign=CDBMY9NBsp4KICdQoBEVxGWobd0N8y4%2BU09stzUWwlNtLr7ZpELJdM5js20wXv%2FCPp0FGPbRW1YS9DRx0CnKJULZZMqysBUMH2FL39sS0Fgstgy1ydTs7ySXdHziJV0inI%2BDWAsebQqtjk5gQEweUstc%2B%2BnzjdgAulpvWzfJsbknS%2BqUfktSdF2ZOWGhr1CFlfsMFEDS2nzQv4K3E%2BNaeylkzUnRe9M1sjIL%2FYR0wVZ5A3OfHLPf9HzC2B8%2FLu4g7N5Vctkqp2aerDvIkN5SNmDnRGyjOt2b%2BOsLMqG4X06JSsrZT6Ln8PimsrkSOIGbj0gCqscx7BwZfmCQePlCw%3D%3D&# trade_no=2019082622001426981000041778&# auth_app_id=2016092600597838&# version=1.0&app_id=2016092600597838&# sign_type=RSA2&# seller_id=2088102177296610&# timestamp=2019-08-26+13%3A51%3A01"""def dispatch(self, request, *args, **kwargs):self.alipay = AliPay(appid=settings.ALIPAY_APPID,app_notify_url=settings.APP_NOTIFY_URL,app_private_key_path=settings.APP_PRIVATE_KEY_PATH,alipay_public_key_path=settings.ALIPAY_PUBLIC_KEY_PATH,debug=settings.ALIPAY_DEBUG,return_url=settings.RETURN_URL)#处理返回的url参数callback_data = {}for key, value in request.GET.items():callback_data[key] = valuesign = callback_data.pop('sign', None)self.order_sn = callback_data.get('out_trade_no', None) #订单号self.trade_no = callback_data.get('trade_no', None) #支付宝订单号# 验证签名self.verify = self.alipay.verify(callback_data, sign)return super(AlipayView, self).dispatch(request, *args, **kwargs)def get(self, request):"""处理支付宝return_url返回"""if self.verify:self.deposit()#返回个人中心页面return redirect(reverse('users:detail', kwargs={'username': request.user.username}))def post(self, request):"""处理notify_url"""if self.verify:self.deposit()return Response('success')def deposit(self):"""充值操作1.更新用户的金币信息2.更新订单状态为交易成功"""# 数据库中查询订单记录order = OrderInfo.objects.get(order_sn=self.order_sn)order.trade_no = self.trade_no  # 支付宝订单号# 把人民币转换成对应的金币rmb = order.order_mountmoney = convert_rmb_to_money(rmb)# 更新用户的金币order.user.money += Decimal(money)order.user.save()# 订单状态置为交易成功order.pay_status = 'TRADE_SUCCESS'order.save()

当用户付款成功后，会跳转回来，那个就是return_url，处理这个的是get方法，用来更新用户的金币和订单。