微信app支付python代码(python2)

python3应该差不多,

官方文档:

https://pay.weixin.qq.com/wiki/doc/api/app/app.php?chapter=8_1

业务流程:

商户系统和微信支付系统主要交互说明：

#步骤1：用户在商户APP中选择商品，提交订单，选择微信支付。

用户在app页面选择商品,确定数量,提交订单,提供必要的参数

app支付需要的前端参数

1. body 商品描述

2. total_fee 商品价格

#步骤2: 商户后台生成本地订单

生成订单号,保证唯一性

order_sn = "%s%s%s" % (request.user.id, datetime.datetime.now().strftime('%Y%m%d%H%M%S'),

random.randint(1, 99))

根据订单号,生成本地订单(生成订单对象,订单状态肯定是未支付,支付成功的回调时再改为支付成功状态)

def generate_order(user, post_data, order_sn, nickname, openid):

good_kind = post_data.get("good_kind")

good_id = post_data.get('good_id')

paid_amount = post_data.get('paid_amount', 0)

try:

good_kind = int(good_kind)

good_id = int(good_id)

paid_amount = float(paid_amount)

#1 课程 2 会员卡

if good_kind == 1:

course = Course.objects.get(pk=good_id)

record = Record.objects.create(

user=user, course=course, telephone=user.phone, center=get_center_for_appid(),

price=paid_amount, order_sn=order_sn, nickname=nickname, openid=openid)

if not paid_amount:

record.status = 2

record.save()

elif good_kind == 2:

card = Vip.objects.get(pk=good_id)

record = Record.objects.create(

user=user, card=card, price=paid_amount, center=get_center_for_appid(),

order_sn=order_sn, nickname=nickname, telephone=user.phone, openid=openid)

else:

record = None

except Exception as e:

record = None

return record

#步骤3:调用微信支付统一下单接口。参见【统一下单API】。

使用pip install weixin-python==0.5.4(模块)

1.导入from weixin import Weixin

2.初始化(https://www.cnblogs.com/gjh99/p/10536905.html)

we_chat = Weixin(dict(

#app_id 微信开放平台审核通过的应用APPID(请登录open.weixin.qq.com查看，注意与公众号的APPID不同)

WEIXIN_APP_ID=WECHAT_APP_ID,

#mch_id 微信支付分配的商户号

WEIXIN_MCH_ID=WECHAT_MCH_ID,

#mch_key 微信支付密钥

WEIXIN_MCH_KEY=WECHAT_MCH_KEY,

#回调url

WEIXIN_NOTIFY_URL=WECHAT_NOTIFY_URL,

#公钥文件

WEIXIN_MCH_KEY_FILE='',

#私钥文件

WEIXIN_MCH_CERT_FILE=''

))

3.调用模块封装好的方法

必传的参数如下,微信的支付为分

jsdict = we_chat.jsapi(

#订单号

out_trade_no=order_sn,

#商品描述

body=body,

#支付金额

total_fee=int(float(total_fee)*100),

#交易类型

trade_type='APP'

)

4.接收微信后台返回的数据字典jsdict,需要返回给前台

{

"status": 1,

"data": {

"appId": "你的appid",

"package": "prepay_id=wx11162703519516e69f7864b91520314800",

"prepay_id": "wx11162703519516e69f7864b91520314800",

"timeStamp": "1576052824",

"nonceStr": "pqfQOyiMs8d9aAqhS7g8n9WCCyjHPYc6",

"signType": "MD5",

"sign": "396451156447F8DB4590E4ADE5C041AD"

}

}

5.微信app支付需要重新生成签名

统一下单接口返回正常的prepay_id，再按签名规范重新生成签名后，将数据传输给APP。参与签名的字段名为appid，partnerid，prepayid，noncestr，timestamp，package。注意：package的值格式为Sign=WXPay

new_sign = app_pay_sign(jsdict, we_chat)

#注意 字典的参数要跟微信要求的一模一样,就是data的key要完全和下面的代码一样

def app_pay_sign(jsdict, we_chat):

try:

data = dict()

data["appid"] = jsdict["appId"]

data["partnerid"] = WECHAT_MCH_ID

data["prepayid"] = jsdict["prepay_id"]

data["noncestr"] = jsdict["nonceStr"]

data["timestamp"] = jsdict["timeStamp"]

data["package"] = jsdict["package"]

return we_chat.sign(data)

except KeyError:

return

6. 重新签名后将数据返回给前端,后台就算完成了

jsdict["sign"] = new_sign

7. 写回调函数

@api_view(['POST'])

@permission_classes([AllowAny])

def wechat_callback(request):

if request.method == 'POST':

try:

data = we_chat.to_dict(request.body)

order_sn = data.get('out_trade_no', '')

# 支付结果，用户正常支付，会返回SUCCESS

result_code = data.get('result_code', '')

# check 检查微信回传数据是否可靠

if not we_chat.check(data):

return HttpResponse(we_chat.reply("签名验证失败", False))

if result_code == 'SUCCESS':

return HttpResponse(we_chat.reply("OK", True), content_type='text/xml')

except Exception as e:

return HttpResponse(we_chat.reply("签名验证失败", False), content_type='text/xml')

#后台python代码

class WeChatPayViewSet(viewsets.ViewSet):

permission_classes = (IsAuthenticated,)

@list_route(methods=["POST"])

def app_pay(self, request, *args, **kwargs):

try:

post_data = request.DATA

body = post_data.get('body', '微信支付测试')

total_fee = post_data.get('total_fee', 0.01)

if not total_fee:

return Response({"status": 0, "errormsg": "缺少参数"})

# 订单号生成规则：用户id+当前时间+随机数

order_sn = "%s%s%s" % (request.user.id, datetime.datetime.now().strftime('%Y%m%d%H%M%S'),

random.randint(1, 99))

# 生成本地订单

order = generate_order()

jsdict = we_chat.jsapi(out_trade_no=order_sn, body=body, total_fee=int(float(total_fee)*100),

trade_type='APP')

jsdict["prepay_id"] = jsdict.get("package").split("=")[-1]

new_sign = app_pay_sign(jsdict, we_chat)

if not new_sign:

return Response({"status": 0, "errormsg": "调用微信统一下单接口失败,缺少必要参数"})

jsdict["sign"] = new_sign

return Response({"status": 1, "data": jsdict})

except Exception as e:

return Response({"status": 0, "errormsg": e})

#步骤4：商户APP调起微信支付。api参见本章节【app端开发步骤说明】

#步骤5：商户后台接收支付通知。api参见【支付结果通知API】

#步骤6：商户后台查询支付结果。，api参见【查询订单API】