(Unicode 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 <CkHttpW.h>
#include <CkDateTimeW.h>
#include <CkPrngW.h>
#include <CkCrypt2W.h>
#include <CkStringBuilderW.h>
#include <CkXmlW.h>
#include <CkHttpResponseW.h>

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

    CkHttpW 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 wchar_t *testUrl = L"https://test.realexpayments.com/epage-remote.cgi";
    const wchar_t *clientID = L"realexsandbox";
    const wchar_t *sharedSecret = L"Po8lRRT67a";

    const wchar_t *amount = L"1001";
    const wchar_t *currency = L"EUR";
    const wchar_t *cardNumber = L"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
    CkDateTimeW dt;
    dt.SetFromCurrentSystemTime();
    const wchar_t *dtStr = dt.getAsIso8601(L"YYYYMMDDhhmmss",true);

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

    // Compute the sha1hash
    CkCrypt2W crypt;
    crypt.put_HashAlgorithm(L"sha1");
    crypt.put_EncodingMode(L"hexlower");

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

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

    CkStringBuilderW sbB;
    sbB.Append(hashA);
    sbB.Append(L".");
    sbB.Append(sharedSecret);

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

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

    CkHttpResponseW *resp = http.PostXml(testUrl,xml.getXml(),L"utf-8");
    if (http.get_LastMethodSuccess() == false) {
        wprintf(L"%s\n",http.lastErrorText());
        return;
    }

    wprintf(L"Response Status Code: %d\n",resp->get_StatusCode());

    wprintf(L"Response Body:\n");
    wprintf(L"%s\n",resp->bodyStr());

    if (resp->get_StatusCode() != 200) {
        wprintf(L"Failed.\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(L"result");
    wprintf(L"result = %d\n",result);

    // 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) {
        wprintf(L"authcode = %s\n",xml.getChildContent(L"authcode"));
        wprintf(L"Success.\n");

    }
    else {
        wprintf(L"Failed.\n");
    }

    delete resp;
    }