(C++) Global Payments Card Authorization

Demonstrates how to send a card payments authorization request.

For more information, see https://developer.globalpay.com/#!/api/card-payments#api-authorisation

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#include <CkHttp.h>
#include <CkDateTime.h>
#include <CkPrng.h>
#include <CkCrypt2.h>
#include <CkStringBuilder.h>
#include <CkXml.h>
#include <CkHttpResponse.h>

void ChilkatSample(void)
    {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkHttp http;
    bool success;

    // if you don't have a Client ID yet you can still quickly test some basic request types using the following URL and credentials:

    // Test URL - https://test.realexpayments.com/epage-remote.cgi
    // Client ID: realexsandbox
    // Shared Secret: Po8lRRT67a
    const char *testUrl = "https://test.realexpayments.com/epage-remote.cgi";
    const char *clientID = "realexsandbox";
    const char *sharedSecret = "Po8lRRT67a";

    const char *amount = "1001";
    const char *currency = "EUR";
    const char *cardNumber = "4263970000005262";

    // We'll be sending the following XML in the body of the request:

    // <?xml version="1.0" encoding="UTF-8"?>
    // <request type="auth" timestamp="20180613141207">
    //   <merchantid>MerchantId</merchantid>
    //   <account>internet</account>
    //   <channel>ECOM</channel>
    //   <orderid>N6qsk4kYRZihmPrTXWYS6g</orderid>
    //   <amount currency="EUR">1001</amount>
    //   <card>
    //     <number>4263970000005262</number>
    //     <expdate>0425</expdate>
    //     <chname>James Mason</chname>
    //     <type>VISA</type>
    //     <cvn>
    //       <number>123</number>
    //       <presind>1</presind>
    //     </cvn>
    //   </card>
    //   <autosettle flag="1"/>
    //   <sha1hash>87707637a34ba651b6185718c863abc64b673f20</sha1hash>
    // </request>

    // Use this online tool to generate code from sample XML: 
    // Generate Code to Create XML

    // Get the current date/time in this format:  20180613141207
    CkDateTime dt;
    dt.SetFromCurrentSystemTime();
    const char *dtStr = dt.getAsIso8601("YYYYMMDDhhmmss",true);

    // Generate a unique order ID
    CkPrng prng;
    const char *orderId = prng.genRandom(32,"base64url");

    // Compute the sha1hash
    CkCrypt2 crypt;
    crypt.put_HashAlgorithm("sha1");
    crypt.put_EncodingMode("hexlower");

    CkStringBuilder sbA;
    sbA.Append("timestamp.merchantid.orderid.amount.currency.cardnumber");
    int numReplaced = sbA.Replace("timestamp",dtStr);
    numReplaced = sbA.Replace("merchantid",clientID);
    numReplaced = sbA.Replace("orderid",orderId);
    numReplaced = sbA.Replace("amount",amount);
    numReplaced = sbA.Replace("currency",currency);
    numReplaced = sbA.Replace("cardnumber",cardNumber);

    const char *hashA = crypt.hashStringENC(sbA.getAsString());

    CkStringBuilder sbB;
    sbB.Append(hashA);
    sbB.Append(".");
    sbB.Append(sharedSecret);

    const char *hashB = crypt.hashStringENC(sbB.getAsString());

    CkXml xml;
    xml.put_Tag("request");
    xml.AddAttribute("type","auth");
    xml.AddAttribute("timestamp",dtStr);
    xml.UpdateChildContent("merchantid",clientID);
    xml.UpdateChildContent("account","internet");
    xml.UpdateChildContent("channel","ECOM");
    xml.UpdateChildContent("orderid",orderId);
    xml.UpdateAttrAt("amount",true,"currency",currency);
    xml.UpdateChildContent("amount",amount);
    xml.UpdateChildContent("card|number",cardNumber);
    xml.UpdateChildContent("card|expdate","0425");
    xml.UpdateChildContent("card|chname","James Mason");
    xml.UpdateChildContent("card|type","VISA");
    xml.UpdateChildContent("card|cvn|number","123");
    xml.UpdateChildContent("card|cvn|presind","1");
    xml.UpdateAttrAt("autosettle",true,"flag","1");
    xml.UpdateChildContent("sha1hash",hashB);

    CkHttpResponse *resp = http.PostXml(testUrl,xml.getXml(),"utf-8");
    if (http.get_LastMethodSuccess() == false) {
        std::cout << http.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "Response Status Code: " << resp->get_StatusCode() << "\r\n";

    std::cout << "Response Body:" << "\r\n";
    std::cout << resp->bodyStr() << "\r\n";

    if (resp->get_StatusCode() != 200) {
        std::cout << "Failed." << "\r\n";
        return;
    }

    // A status code of 200 indicates we received an XML response, but it could be an error message.
    // Here's an example of an error response:

    // <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
    // <response timestamp="20200418142356">
    //     <orderid>N6qsk4kYRZihmPrTXWYS6g</orderid>
    //     <result>508</result>
    //     <message>Invalid timestamp: '{' Value exceeds allowable limit: '}'</message>
    // </response>

    // We need to check the "result" within the XML.
    xml.LoadXml(resp->bodyStr());

    int result = xml.GetChildIntValue("result");
    std::cout << "result = " << result << "\r\n";

    // A successful result looks like this:

    // <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
    // <response timestamp="20200418145519">
    //     <merchantid>realexsandbox</merchantid>
    //     <account>internet</account>
    //     <orderid>Cw93I1nFWVZuaATh46qMUCBlCcfrOvLo65C2cq5X-AY</orderid>
    //     <result>00</result>
    //     <authcode>L3pHww</authcode>
    //     <message>AUTH CODE: L3pHww</message>
    //     <pasref>96838535689610806</pasref>
    //     <cvnresult>M</cvnresult>
    //     <timetaken>87</timetaken>
    //     <authtimetaken>67</authtimetaken>
    //     <batchid>6322506</batchid>
    //     <sha1hash>2fd2f15f97f1775779fe9bda536dc8317a4b39f6</sha1hash>
    // </response>

    if (result == 0) {
        std::cout << "authcode = " << xml.getChildContent("authcode") << "\r\n";
        std::cout << "Success." << "\r\n";

    }
    else {
        std::cout << "Failed." << "\r\n";
    }

    delete resp;
    }