随后我们获取到这样的参数：
{
"appid":"wxd930ea5d5a258f4f",
"noncestr":"e7d161ac8d8a76529d39d9f5b4249ccb",
"package":"Sign=WXpay";
"partnerid":"1900000109"
"prepayid":"1101000000140429eb40476f8896f4c9",
"sign":"7ffecb600d7157c5aa49810d2d8f28bc2811827b",
"timestamp":"1399514976"
}
获取prepayid
代码如下：
‘‘‘获取预支付prepayid‘‘‘
def gerPrepayId(self, token, requestParams):
‘‘‘将参数，包括package，进行json化，然后发起post请求‘‘‘
data = json.dumps(requestParams)
response = requests.post(self.gateUrl % (token), data=data)
if response.status_code == 200:
text = response.text
text = json.loads(text)
errcode = text[‘errcode‘]
if errcode == 0:
return text[‘prepayid‘]
return None
我们获取的prepayid格式应该是这样：
{"prepayid":"1101000000140429eb40476f8896f4c9","errcode":0,"errmsg":"Success"}
再次签名
这里采用上面sha1的签名方式再次签名，获取到下面的参数：
{
"appid":"wxd930ea5d5a258f4f",
"noncestr":"e7d161ac8d8a76529d39d9f5b4249ccb",
"package":"Sign=WXpay";
"partnerid":"1900000109"
"prepayid":"1101000000140429eb40476f8896f4c9",
"sign":"7ffecb600d7157c5aa49810d2d8f28bc2811827b",
"timestamp":"1399514976"
}
后台服务器将该结果返回给app，此时app即可发起支付。
上面的流程代码为：
‘‘‘接收app的请求，返回prepayid‘‘‘
class WeixinRequirePrePaidHandler(BasicTemplateHandler):
‘‘‘这个方法在OrdersAddHandler中被调用‘‘‘
@staticmethod
def getPrePaidResult(order_no, total_pay, product_name, client_ip):
‘‘‘封装了常用的签名算法‘‘‘
weixinRequestHandler = WeixinRequestHandler(order_no)
‘‘‘收集订单相关信息‘‘‘
addtion = str(random.randint(10, 100)) #产生一个两位的数字，拼接在订单号的后面
out_trade_no = str(order_no) + addtion
order_price = float(total_pay) #这里必须允许浮点数，后面转化成分之后转化为int
#order_price = 0.01 #测试
remote_addr = client_ip #客户端的IP地址
print remote_addr
current_time = int(time.time())
order_create_time = str(current_time)
order_deadline = str(current_time + 20*60)
‘‘‘这里的一些参数供下面使用‘‘‘
noncestr = hashlib.md5(str(random.random())).hexdigest()
timestamp = str(int(time.time()))
pack = ‘Sign=WXPay‘
‘‘‘获取token‘‘‘
access_token = weixinRequestHandler.getAccessToken()
logging.info("get token: %s" % access_token)
if access_token:
‘‘‘设置package参数‘‘‘
packageParams = {}
packageParams[‘bank_type‘] = ‘WX‘ #支付类型
packageParams[‘body‘] = product_name #商品名称
packageParams[‘fee_type‘] = ‘1‘ #人民币 fen
packageParams[‘input_charset‘] = ‘GBK‘ #GBK
packageParams[‘notify_url‘] = config[‘notify_url‘] #post异步消息通知
packageParams[‘out_trade_no‘] = str(out_trade_no) #订单号
packageParams[‘partner‘] = config[‘partnerId‘] #商户号
packageParams[‘total_fee‘] = str(int(order_price*100)) #订单金额,单位是分
packageParams[‘spbill_create_ip‘] = remote_addr #IP
packageParams[‘time_start‘] = order_create_time #订单生成时间
packageParams[‘time_expire‘] = order_deadline #订单失效时间
‘‘‘获取package‘‘‘
package = weixinRequestHandler.getPackage(packageParams)
‘‘‘设置支付参数‘‘‘
signParams = {}
signParams[‘appid‘] = config[‘appId‘]
signParams[‘appkey‘] = config[‘paySignKey‘] #delete
signParams[‘noncestr‘] = noncestr
signParams[‘package‘] = package
signParams[‘timestamp‘] = timestamp
signParams[‘traceid‘] = ‘mytraceid_001‘
‘‘‘生成支付签名‘‘‘
app_signature = weixinRequestHandler.createSHA1Signature(signParams)
‘‘‘增加不参与签名的额外参数‘‘‘
signParams[‘sign_method‘] = ‘sha1‘
signParams[‘app_signature‘] = app_signature
‘‘‘剔除appKey‘‘‘
del signParams[‘appkey‘]
‘‘‘获取prepayid‘‘‘
prepayid = weixinRequestHandler.gerPrepayId(access_token, signParams)
if prepayid:
‘‘‘使用拿到的prepayid再次准备签名‘‘‘
pack = ‘sign=WXPay‘
prepayParams = {}
prepayParams[‘appid‘] = config[‘appId‘]
prepayParams[‘appkey‘] = config[‘paySignKey‘]
prepayParams[‘noncestr‘] = noncestr
prepayParams[‘package‘] = pack
prepayParams[‘partnerid‘] = config[‘partnerId‘]
prepayParams[‘prepayid‘] = prepayid
prepayParams[‘timestamp‘] = timestamp
‘‘‘生成签名‘‘‘
sign = weixinRequestHandler.createSHA1Signature(prepayParams)
‘‘‘准备输出参数‘‘‘
returnParams = {}
returnParams[‘status‘] = 0
returnParams[‘retmsg‘] = ‘success‘
returnParams[‘appid‘] = config[‘appId‘]
returnParams[‘noncestr‘] = noncestr
returnParams[‘package‘] = pack
returnParams[‘prepayid‘] = prepayid
returnParams[‘timestamp‘] = timestamp
returnParams[‘sign‘] = sign
returnParams[‘partnerId‘] = config[‘partnerId‘]
returnParams[‘addtion‘] = addtion
else:
‘‘‘prepayid获取失败‘‘‘
returnParams = {}
returnParams[‘status‘] = -1
returnParams[‘retmsg‘] = ‘prepayid获取失败‘
else:
‘‘‘token获取失败‘‘‘
returnParams = {}
returnParams[‘status‘] = -1
returnParams[‘retmsg‘] = ‘token获取失败‘
‘‘‘生成json格式文本，然后返回给APP‘‘‘
return returnParams
