如何获取PayPal API签名

说明书原文：

You'll need to create an API username for PayPal that's different from your shopping cart's username You can access PayPal via API only if you have a PayPal Premier / Business / Website Payments Pro account ［需要在你的后台设定API用户名，只有Paypal高级与商业用户可以使用API。］

Follow these steps:

Log in to your PayPal Business account ［登陆paypal账户。］

Click the My Account tab ［进入我的账户。］

Click the Profile tab If you haven't already done so, you need to verify your account before requesting API credentials ［已认证用户，进入我的设置。］

Click Request API credentials under Account information ［在Account information里点击Request API credentials。］

Click Set up PayPal API credentials and permissions under Option 1［在Option 1区域点击Set up Paypal API credentials and permissions]

Click Request API Credentials［点击Request API Credentials。］

Click Request API signature［点击Request API 签名。］

Click Agree and Submit［点击同意和提交。］

Copy and paste the API username, password, and signature into your shopping cart's configuration or administration screen［复制粘贴API的用户名，密码，和签名到你的网站后台设置。］

Complete the process by following your shopping cart's final steps［剩下的 *** 作步骤转至你的后台。］

/// <summary> /// 验证微信签名 /// </summary> /// 将token、timestamp、nonce三个参数进行字典序排序 /// 将三个参数字符串拼接成一个字符串进行sha1加密 /// 开发者获得加密后的字符串可与signature对比，标识该请求来源于微信。 /// <returns></returns> private bool CheckSignature() { string signature = RequestQueryString["signature"]; string timestamp = RequestQueryString["timestamp"]; string nonce = RequestQueryString["nonce"]; string[] ArrTmp = { Token, timestamp, nonce }; ArraySort(ArrTmp); //字典排序 string tmpStr = stringJoin("", ArrTmp); tmpStr = FormsAuthenticationHashPasswordForStoringInConfigFile(tmpStr, "SHA1"); tmpStr = tmpStrToLower(); if (tmpStr == signature) { return true; } else { return false; } } public static bool CheckSignature(String signature, String timestamp, String nonce) { String[] arr = new String[] { Token, timestamp, nonce }; // 将token、timestamp、nonce三个参数进行字典序排序 ArraySort<String>(arr); StringBuilder content = new StringBuilder(); for (int i = 0; i < arrLength; i++) { contentAppend(arr[i]); } String tmpStr = SHA1_Encrypt(contentToString()); // 将sha1加密后的字符串可与signature对比，标识该请求来源于微信 return tmpStr != null tmpStrEquals(signature) : false; } /// <summary> /// 使用缺省密钥给字符串加密 /// </summary> /// <param name="Source_String"></param> /// <returns></returns> public static string SHA1_Encrypt(string Source_String) { byte[] StrRes = EncodingDefaultGetBytes(Source_String); HashAlgorithm iSHA = new SHA1CryptoServiceProvider(); StrRes = iSHAComputeHash(StrRes); StringBuilder EnText = new StringBuilder(); foreach (byte iByte in StrRes) { EnTextAppendFormat("{0:x2}", iByte); } return EnTextToString(); } private void Valid() { string echoStr = RequestQueryString["echoStr"]; if (CheckSignature()) { if (!stringIsNullOrEmpty(echoStr)) { ResponseWrite(echoStr); ResponseEnd(); } } } /// <summary> /// unix时间转换为datetime /// </summary> /// <param name="timeStamp"></param> /// <returns></returns> private DateTime UnixTimeToTime(string timeStamp) { DateTime dtStart = TimeZoneCurrentTimeZoneToLocalTime(new DateTime(1970, 1, 1)); long lTime = longParse(timeStamp + "0000000"); TimeSpan toNow = new TimeSpan(lTime); return dtStartAdd(toNow); } /// <summary> /// datetime转换为unixtime /// </summary> /// <param name="time"></param> /// <returns></returns> private int ConvertDateTimeInt(SystemDateTime time) { SystemDateTime startTime = TimeZoneCurrentTimeZoneToLocalTime(new SystemDateTime(1970, 1, 1)); return (int)(time - startTime)TotalSeconds; } #endregion

把返回错误接口里的requestip地址加到服务器出口IP列表中，可参考>

publicvoidgetSingInfo(){try{PackageInfopackageInfo=getPackageManager()getPackageInfo("comexampleyao",PackageManagerGET_SIGNATURES);Signature[]signs=packageInfosignatures;Signaturesign=signs[0];parseSignature(signtoByteArray());}catch(Exceptione){eprintStackTrace();}}publicvoidparseSignature(byte[]signature){try{CertificateFactorycertFactory=CertificateFactorygetInstance("X509");X509Certificatecert=(X509Certificate)certFactorygenerateCertificate(newByteArrayInputStream(signature));StringpubKey=certgetPublicKey()toString();StringsignNumber=certgetSerialNumber()toString();Systemoutprintln("pubKey:"+pubKey);Systemoutprintln("signNumber:"+signNumber);}catch(CertificateExceptione){eprintStackTrace();}}

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