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                ### :-: 簽名算法 簽名生成的通用步驟如下: 第一步,設所有發送或者接收到的數據為集合M,將集合M內非空參數值的參數按照參數名ASCII碼從小到大排序(字典序) 第二步,將ASCII排序后的參數取參數值拼接起來(即`value1value2value3`)拼接成字符串stringA。 特別注意以下重要規則: ◆ 參數名ASCII碼從小到大排序(字典序); ◆ 如果參數的值為空不參與簽名; ◆ 參數名區分大小寫; ◆ 參數名區分大小寫; 第三步,在stringA拼接上payKey得到stringSignTemp字符串,并對stringSignTemp進行MD5運算(32位小寫),將結果賦值給Sign。 ◆ payKey獲取路徑:ISPAY商戶平臺([https://www.ispay.cn]())-->開發者-->應用配置-->商戶密鑰 舉例: 假設傳送的參數: ``` payId:10000 payChannel:wxpay Subject:測試標題 Money:100 orderNumber:201702080118441263011007 attachData:test ``` 第一步:按照參數名ASCII字典序排序: ``` Money:100 Subject:測試標題 attachData:test orderNumber:201702080118441263011007 payChannel:wxpay payId:10000 ``` 第二步:將ASCII字典序排序后的參數取參數值依次拼接成字符串: ``` stringA = "100測試標題test201702080118441263011007wxpay10000" ``` 第三步:拼接商戶密鑰(payKey)并完成MD5加密: ``` stringSignTemp = stringA + payKey //注:payKey為商戶密鑰在后臺獲取 Sign = md5(stringSignTemp) ``` 得到最終發送的數據: ``` payId:10000 payChannel:wxpay Subject:測試標題 Money:100 orderNumber:201702080118441263011007 attachData:test Sign:d03a67eda097c2ecfaceb170a8527035 ```
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