起因：

????????因公司項目需要網上充值功能，從而對接微信支付，目前也只對接了微信支付的小程序支付功能，在網上找到的都是對接微信支付V2版本接口,與我所對接的接口版本不一致，無法使用，特此記錄下微信支付完成功能，使用Django完成后端功能，此文章用于記錄使用，

????????以下代碼僅供參考，如若直接商用出現任何后果請自行承擔，本人概不負責。

功能：

? ? ? ?調起微信支付，微信回調

代碼：
? ? ? ? 1、準備工作：

mchid = "xxxxxx" # 商戶號 pay_key = "xxxxxx" # 商戶秘鑰V3 使用V3接口必須使用V3秘鑰 serial_num = "xxxxxx" # 證書序列號# ======================前三個參數在微信支付中可找到=============================== # ============ 商戶號(mchid ) 在賬戶中心——商戶信息——微信支付商戶號 （是純數字） ================== # ============= 商戶秘鑰(pay_key) 在賬戶中心——API安全——APIv3秘鑰 （需手動設置） =================== # ============= 證書序列號(serial_num) 在賬戶中心——API安全——API證書 （需手動申請,通過后會有串證書序列號），申請完成后需要把證書下載到項目中，便于使用 ===================appid = "xxxxxx" # 微信小程序appid wx_secret ="xxxxxx" # 微信小程序秘鑰 # ============= 微信小程序appid 在產品中心——AppID賬號管理——添加關聯的AppID =================== WX_Pay_URL = "https://api.mch.weixin.qq.com/v3/pay/transactions/jsapi" # ============= 微信支付調用地址,用于請求接收 預支付交易會話標識: prepay_id =================== WX_Notify_URL = "https://127.0.0.1:8000" # ============= 接收微信支付回調地址,必須是https ===================

? ? ? ? 2、調起微信支付（后端只能請求微信支付接口向微信支付官方獲取到預支付交易會話標識，并返回給前端，前端才能調起輸入密碼支付界面）

import json import decimal import tracebackimport requests from django.http import HttpResponsedef payment_view(request, *args, **kwargs):"""微信支付（小程序）:param request::param args::param kwargs::return:"""try:reqdata = json.loads(request.body)# 前端參數jscode = reqdata["jscode"] # 微信IDprice = decimal.Decimal(reqdata["price"]).quantize(decimal.Decimal("0.00")) # 充值金額,保留兩位小數nickname = reqdata["nickname"] # 微信昵稱/支付寶名稱 前端獲取到返給后端做記錄,可要可不要的字段paymode = reqdata["paymode"] # 支付方式 1微信支付remark = reqdata["remark"] # 支付內容描述# 根據jscode 獲取openIDrets = requests.get(url = "https://api.weixin.qq.com/sns/jscode2session?" \"appid=%s&secret=%s&js_code=%s" \"&grant_type=authorization_code" % (appid,wx_secret, js_code), timeout=3, verify=False)if not rets:return HttpResponse(general_error_msg(msg="未獲取到微信信息"))# 0.獲取支付的微信openidprint(f"組織ID:{userinfo['orgid']}, jscode:{jscode}")wxuser = getappopenid(orgid, jscode)if wxuser:# session_key = wxuser["session_key"]openid = wxuser["openid"]else:return HttpResponse(general_error_msg(msg="未獲取到微信用戶信息"))# 1.以交易日期生成交易號orderno = order_num()# 2.生成新交易記錄 paystatus 支付狀態 1成功 0待支付 -1支付失敗conorder.objects.create(orderno=orderno, openid=openid, openname=nickname,paymode=paymode,goodstotalprice=price, paystatus=0, remark=remark,createtime=get_now_time(1))# 3.生成統一下單的報文bodyurl = WX_Pay_URLbody = {"appid": appid,"mchid": mchid,"description": remark,"out_trade_no": orderno,"notify_url": WX_Notify_URL + "/pay/notify", # 后端接收回調通知的接口"amount": {"total": int(price * 100), "currency": "CNY"}, # 正式上線price要*100，微信金額單位為分（必須整型）。"payer": {"openid": openid},}data = json.dumps(body)headers, random_str, time_stamps = make_headers_v3(mchid, serial_num, data=data, method='POST')# 10.發送請求獲得prepay_idtry:response = requests.post(url, data=data, headers=headers) # 獲取預支付交易會話標識（prepay_id）print("預支付交易會話標識", response)if response.status_code == 200:wechatpay_serial, wechatpay_timestamp, wechatpay_nonce, wechatpay_signature, certificate, serial_no = check_wx_cert(response, mchid, pay_key, serial_num)# 11.9簽名驗證if wechatpay_serial == serial_no: # 應答簽名中的序列號同證書序列號應相同print('serial_no match')try:data3 = f"{wechatpay_timestamp}\n{wechatpay_nonce}\n{response.text}\n"verify(data3, wechatpay_signature, certificate)print('The signature is valid.')# 12.生成調起支付API需要的參數并返回前端res = {'orderno': orderno, # 訂單號'timeStamp': time_stamps,'nonceStr': random_str,'package': 'prepay_id=' + response.json()['prepay_id'],'signType': "RSA",'paySign': get_sign(f"{appid}\n{time_stamps}\n{random_str}\n{'prepay_id=' + response.json()['prepay_id']}\n"),}return HttpResponse(success_msg(msg="下單成功", total=0, data=res))except Exception as e:log.error(f"證書序列號驗簽失敗{e}, {traceback.format_exc()}")return HttpResponse(general_error_msg(msg="下單失敗"))else:log.error(f"證書序列號比對失敗【請求頭中證書序列號：{wechatpay_serial}；本地存儲證書序列號：{serial_no}；】")return HttpResponse(general_error_msg(msg="調起微信支付失敗!"))else:log.error(f"獲取預支付交易會話標識 接口報錯【params：{data}；headers：{headers}；response：{response.text}】")return HttpResponse(general_error_msg(msg="調起微信支付失敗!"))except Exception as e:log.error(f"調用微信支付接口超時【params：{data}；headers：{headers}；】：{e},{traceback.format_exc()}")return HttpResponse(general_error_msg(msg="微信支付超時!"))except Exception as e:log.error(f"微信支付接口報錯：{e},{traceback.format_exc()}")return HttpResponse(general_error_msg(msg="微信支付接口報錯!"))

3、相關方法

import base64 import random import string import time import traceback from datetime import datetimeimport requests from BaseMethods.log import log from Crypto.PublicKey import RSA from Crypto.Signature import pkcs1_15 from Cryptodome.Hash import SHA256 from sqlalchemy.util import b64encode from cryptography.hazmat.primitives.ciphers.aead import AESGCM# 各包版本 # django-ratelimit==3.0.1 # SQLAlchemy~=1.4.44 # pycryptodome==3.16.0 # pycryptodomex==3.16.0 # cryptography~=38.0.4 # Django~=3.2.4# 獲取唯一標識 def get_uuid(utype=0):"""唯一碼:param utype::return:"""if utype == 0:return uuid.uuid1()elif utype == 1:return str(uuid.uuid1())elif utype == 2:return str(uuid.uuid1().hex)elif utype == 3:return str((uuid.uuid5(uuid.NAMESPACE_DNS, str(uuid.uuid1()) + str(random.random()))))# 獲取當前時間 def get_now_time(type=0):""":param type: 類型0-5:return: yyyy-mm-dd HH:MM:SS;y-m-d H:M:S.f;y-m-d;ymdHMS;y年m月d日h時M分S秒"""if type == 0:return datetime.datetime.now()elif type == 1:return datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")elif type == 2:return datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S.%f")elif type == 3:return datetime.datetime.now().strftime("%Y-%m-%d")elif type == 4:return datetime.datetime.now().strftime("%Y%m%d%H%M%S")elif type == 5:locale.setlocale(locale.LC_CTYPE, 'chinese')timestr = datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")t = time.strptime(timestr, "%Y-%m-%d %H:%M:%S")result = (time.strftime("%Y年%m月%d日%H時%M分%S秒", t))return resultelif type == 6:return datetime.datetime.now().strftime("%Y%m%d")# 重構系統jargon類，用于處理時間格式報錯問題 class DateEncoder(json.JSONEncoder):def default(self, obj):if isinstance(obj, datetime.datetime):return obj.strftime('%Y-%m-%d %H:%M:%S')elif isinstance(obj, datetime.date):return obj.strftime("%Y-%m-%d")elif isinstance(obj, Decimal):return float(obj)elif isinstance(obj, bytes):return str(obj, encoding='utf-8')elif isinstance(obj, uuid.UUID):return str(obj)elif isinstance(obj, datetime.time):return obj.strftime('%H:%M')elif isinstance(obj, datetime.timedelta):return str(obj)else:return json.JSONEncoder.default(self, obj)def decrypt(nonce, ciphertext, associated_data, pay_key):"""AES解密:param nonce::param ciphertext::param associated_data::param pay_key::return:"""key = pay_keykey_bytes = str.encode(key)nonce_bytes = str.encode(nonce)ad_bytes = str.encode(associated_data)data = base64.b64decode(ciphertext)aesgcm = AESGCM(key_bytes)return aesgcm.decrypt(nonce_bytes, data, ad_bytes)def order_num():"""生成訂單號:return:"""# 下單時間的年月日毫秒12+隨機數8位now_time = datetime.now()result = str(now_time.year) + str(now_time.month) + str(now_time.day) + str(now_time.microsecond) + str(random.randrange(10000000, 99999999))return resultdef get_sign(sign_str):"""定義生成簽名的函數:param sign_str::return:"""try:with open(r'static/cret/apiclient_key.pem') as f:private_key = f.read()rsa_key = RSA.importKey(private_key)signer = pkcs1_15.new(rsa_key)digest = SHA256.new(sign_str.encode('utf-8'))# sign = b64encode(signer.sign(digest)).decode('utf-8')sign = b64encode(signer.sign(digest))return signexcept Exception as e:log.error("生成簽名的函數方法報錯【func：get_sign；sign_str：%s】：%s ==> %s" % (sign_str, e, traceback.format_exc()))def check_wx_cert(response, mchid, pay_key, serial_no):"""微信平臺證書:param response: 請求微信支付平臺所對應的的接口返回的響應值:param mchid: 商戶號:param pay_key: 商戶號秘鑰:param serial_no: 證書序列號:return:"""wechatpay_serial, wechatpay_timestamp, wechatpay_nonce, wechatpay_signature, certificate = None, None, None, None, Nonetry:# 11.應答簽名驗證wechatpay_serial = response.headers['Wechatpay-Serial'] # 獲取HTTP頭部中包括回調報文的證書序列號wechatpay_signature = response.headers['Wechatpay-Signature'] # 獲取HTTP頭部中包括回調報文的簽名wechatpay_timestamp = response.headers['Wechatpay-Timestamp'] # 獲取HTTP頭部中包括回調報文的時間戳wechatpay_nonce = response.headers['Wechatpay-Nonce'] # 獲取HTTP頭部中包括回調報文的隨機串# 11.1.獲取微信平臺證書 （等于又把前面的跑一遍，實際上應是獲得一次證書就存起來，不用每次都重新獲取一次）url2 = "https://api.mch.weixin.qq.com/v3/certificates"# 11.2.生成證書請求隨機串random_str2 = ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(32))# 11.3.生成證書請求時間戳time_stamps2 = str(int(time.time()))# 11.4.生成請求證書的簽名串data2 = ""sign_str2 = f"GET\n{'/v3/certificates'}\n{time_stamps2}\n{random_str2}\n{data2}\n"# 11.5.生成簽名sign2 = get_sign(sign_str2)# 11.6.生成HTTP請求頭headers2 = {"Content-Type": "application/json","Accept": "application/json","Authorization": 'WECHATPAY2-SHA256-RSA2048 '+ f'mchid="{mchid}",nonce_str="{random_str2}",signature="{sign2}",timestamp="{time_stamps2}",serial_no="{serial_no}"'}# 11.7.發送請求獲得證書response2 = requests.get(url2, headers=headers2) # 只需要請求頭cert = response2.json()# 11.8.證書解密nonce = cert["data"][0]['encrypt_certificate']['nonce']ciphertext = cert["data"][0]['encrypt_certificate']['ciphertext']associated_data = cert["data"][0]['encrypt_certificate']['associated_data']serial_no = cert["data"][0]['serial_no']certificate = decrypt(nonce, ciphertext, associated_data, pay_key)except Exception as e:log.error(f"微信平臺證書驗證報錯：{e}；{traceback.format_exc()}")return wechatpay_serial, wechatpay_timestamp, wechatpay_nonce, wechatpay_signature, certificate, serial_nodef verify(check_data, signature, certificate):"""驗簽函數:param check_data::param signature::param certificate::return:"""key = RSA.importKey(certificate) # 這里直接用了解密后的證書，但沒有去導出公鑰，似乎也是可以的。怎么導公鑰還沒搞懂。verifier = pkcs1_15.new(key)hash_obj = SHA256.new(check_data.encode('utf8'))return verifier.verify(hash_obj, base64.b64decode(signature))def make_headers_v3(mchid, serial_num, data='', method='GET'):"""定義微信支付請求接口中請求頭認證:param mchid: 商戶ID:param serial_num: 證書序列號:param data: 請求體內容:param method: 請求方法:return: headers(請求頭)"""# 4.定義生成簽名的函數 get_sign(sign_str)# 5.生成請求隨機串random_str = ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(32))# 6.生成請求時間戳time_stamps = str(int(time.time()))# 7.生成簽名串sign_str = f"{method}\n{'/v3/pay/transactions/jsapi'}\n{time_stamps}\n{random_str}\n{data}\n"# 8.生成簽名sign = get_sign(sign_str)# 9.生成HTTP請求頭headers = {'Content-Type': 'application/json','Authorization': 'WECHATPAY2-SHA256-RSA2048 '+ f'mchid="{mchid}",nonce_str="{random_str}",signature="{sign}",timestamp="{time_stamps}",serial_no="{serial_num}"'}return headers, random_str, time_stamps

4、微信回調

import decimal import json import tracebackfrom django.http import HttpResponsedef notify_view(request, *args, **kwargs):"""支付完成之后的通知(微信官方返回的數據):param request::param args::param kwargs::return:"""try:# 1.獲得支付通知的參數body = request.bodydata = bytes.decode(body, 'utf-8')newdata = json.loads(data)# newdata = {# "id": "9d40acfd-13cb-5175-a5aa-6c421f794952",# "create_time": "2023-01-06T15:12:49+08:00",# "resource_type": "encrypt-resource",# "event_type": "TRANSACTION.SUCCESS",# "summary": "\xe6\x94\xaf\xe4\xbb\x98\xe6\x88\x90\xe5\x8a\x9f",# "resource": {# "original_type":# "transaction",# "algorithm": "AEAD_AES_256_GCM",# "ciphertext": "UF5gLXfe8qBv9qxQsf+/Mb6as+vbIhUS8Dm25qGIJIIdXTorUUjqZH1+"# "jMQxkxma/Gn9bOxeAoQWPEuIoJ2pB328Iv90jmHTrouoP3L60mjNgGJS8d3H8i1zAPBXCpP4mgvgRANWsw4pAWj1lFM5BZr4aP+"# "pNMc5TdwreGBG3rO9sbCLXsSRfW8pVZ7IfPnhPDTOWP3P1k5ikHedcRt4/HP69oDBEe5RSsD93wO/"# "lrIwycStVHyecBaliwpVMRnNnRCXqhlalNJ3NJ6jcgy32fP1J+L90ntwGyqMmZUS71P5TN1H0iH5rXNpRY9IF3pvN+"# "lei5IS86wEoVXkmEsPcJrHaabn7rghxuZoqwuauMIiMwBLllnEmgXfAbJA4FJy+"# "OLhZPrMWMkkiNCLcL069QlvhLXYi/0V9PQVTnvtA5RLarj26s4WSqTZ2I5VGHbTqSIZvZYK3F275KEbQsemYETl18xwZ+"# "WAuSrYaSKN/pKykK37vUGtT3FeIoJup2c6M8Ghull3OcVmqCOsgvU7/pNjl1rLKEJB6t/X9avcHv+feikwQBtBmd/b2qCeSrEpM7US",# "associated_data": "transaction",# "nonce": "cKEdw8eV9Bh0"# }# }nonce = newdata['resource']['nonce']ciphertext = newdata['resource']['ciphertext']associated_data = newdata['resource']['associated_data']try:payment = decrypt(nonce, ciphertext, associated_data, pay_key)breakexcept Exception as e:print(e)if not payment:return HttpResponse({"code": "FAIL", "message": "失敗"}, status=400)payment = eval(payment.decode('utf-8'))# payment = {# "mchid": "xxxx",# "appid": "xxxx",# "out_trade_no": "20231654836163523608",# "transaction_id": "4200001646202301065425000524",# "trade_type": "JSAPI",# "trade_state": "SUCCESS",# "trade_state_desc": "\xe6\x94\xaf\xe4\xbb\x98\xe6\x88\x90\xe5\x8a\x9f",# "bank_type": "OTHERS",# "attach": "",# "success_time": "2023-01-06T15:12:49+08:00",# "payer": {# "openid": "xxxxx"# },# "amount": {# "total": 1,# "payer_total": 1,# "currency": "CNY",# "payer_currency": "CNY"# }# }orderno = payment['out_trade_no']zf_status = True if payment["trade_state"] == "SUCCESS" else Falseif zf_status:money = decimal.Decimal(int(payment["amount"]["payer_total"]) / 100).quantize(decimal.Decimal("0.00"))else:money = decimal.Decimal(0.0).quantize(decimal.Decimal("0.00"))# 7.回調報文簽名驗證# 同第一篇簽名驗證的代碼wechatpay_serial, wechatpay_timestamp, wechatpay_nonce, wechatpay_signature, certificate, serial_no = check_wx_cert(request, mchid, pay_key, serial_num)if wechatpay_serial == serial_no: # 應答簽名中的序列號同證書序列號應相同# 8.獲得回調報文中交易號后修改已支付訂單狀態res = conorder.objects.filter(orderno=orderno, paystatus=0).first()if res:res.paystatus = 1res.save()else:res.paystatus = -1res.save()# 9.項目業務邏輯return HttpResponse({"code": "SUCCESS", "message": "成功"})else:log.error(f"證書序列號比對失敗【請求頭中證書序列號：{wechatpay_serial}；本地存儲證書序列號：{serial_num}；】")return HttpResponse({"code": "FAIL", "message": "失敗"}, status=400)except Exception as e:log.error(f"微信回調接口報錯：{e},{traceback.format_exc()}")return HttpResponse({"code": "FAIL", "message": "失敗"}, status=400)

5、對應表模型

????????

class conorder(models.Model):id = models.CharField(db_column='id', max_length=50, default=getuuid, primary_key=True, verbose_name="訂單ID")orderno = models.CharField(db_column='orderno', max_length=50, null=False, blank=False, verbose_name="訂單編號")serialno = models.CharField(db_column='serialno', max_length=50, null=True, blank=False, verbose_name="流水號")openid = models.CharField(db_column='openid', max_length=50, null=True, blank=False, verbose_name="微信ID/支付寶ID")openname = models.CharField(db_column='openname', max_length=255, null=True, blank=False,verbose_name="微信名稱/支付寶名稱")orgid = models.CharField(db_column='orgid', max_length=50, null=False, blank=False, verbose_name="組織機構ID")iotuserid = models.CharField(db_column='iotuserid', max_length=50, null=False, blank=False, verbose_name="人員ID")invoice = models.CharField(db_column='invoice', max_length=50, null=True, blank=False, verbose_name="發票")invoicenum = models.CharField(db_column='invoicenum', max_length=50, null=True, blank=False, verbose_name="發票號碼")paymode = models.SmallIntegerField(db_column='paymode', null=False, blank=False, verbose_name="支付模式 1微信支付")paysource = models.CharField(db_column='paysource', max_length=50, null=True, blank=False,verbose_name="支付來源 如零錢/銀行卡")goodstotalprice = models.DecimalField(db_column='goodstotalprice', max_digits=12, decimal_places=2, null=False, blank=False,verbose_name="充值金額 單位元")paystatus = models.SmallIntegerField(db_column='paystatus', null=False, blank=False,verbose_name="支付狀態 1成功 0待支付 -1支付失敗")remark = models.CharField(db_column='remark', max_length=200, null=True, blank=False, verbose_name="備注")delstate = models.SmallIntegerField(db_column='delstate', default=0, verbose_name='數據狀態 0正常 1已刪除')createtime = models.DateTimeField(db_column='createtime', auto_now_add=True, null=True, verbose_name="建立時間")createoprid = models.CharField(db_column='createoprid', max_length=50, null=True, verbose_name="建立人員")updatetime = models.DateTimeField(db_column='updatetime', auto_now=True, null=True, verbose_name="更新時間 充值成功與否的時間")updateoprid = models.CharField(db_column='updateoprid', max_length=50, null=True, verbose_name="更新人員")class Meta:db_table = "order"indexes = [models.Index(fields=['iotuserid'], name='order_userid'),]verbose_name = "充值訂單表"verbose_name_plural = verbose_name

6、借鑒地址：

? ? ? ? 在此非常感謝博主，文章鏈接如下：一文基本搞定python的django框架下微信支付v3的主要流程-1 - 知乎??????從去年底開始，下決心自己寫代碼來搞定自已策劃的微信小程序” 來推鑒--投融資項目推薦服務平臺“后，微信支付就成為擋在前面的一座大山。畢竟是從一個從沒開發過一個程序的基本零基礎，到要真正上線一個能商業運…https://zhuanlan.zhihu.com/p/402449405

7、請注意：

????????以上代碼僅供參考，如若直接商用出現任何后果請自行承擔，本人概不負責。?

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