(Objective-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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#import <CkoHttp.h>
#import <NSString.h>
#import <CkoDateTime.h>
#import <CkoPrng.h>
#import <CkoCrypt2.h>
#import <CkoStringBuilder.h>
#import <CkoXml.h>
#import <CkoHttpResponse.h>

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

CkoHttp *http = [[CkoHttp alloc] init];
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
NSString *testUrl = @"https://test.realexpayments.com/epage-remote.cgi";
NSString *clientID = @"realexsandbox";
NSString *sharedSecret = @"Po8lRRT67a";

NSString *amount = @"1001";
NSString *currency = @"EUR";
NSString *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
CkoDateTime *dt = [[CkoDateTime alloc] init];
[dt SetFromCurrentSystemTime];
NSString *dtStr = [dt GetAsIso8601: @"YYYYMMDDhhmmss" bLocal: YES];

// Generate a unique order ID
CkoPrng *prng = [[CkoPrng alloc] init];
NSString *orderId = [prng GenRandom: [NSNumber numberWithInt: 32] encoding: @"base64url"];

// Compute the sha1hash
CkoCrypt2 *crypt = [[CkoCrypt2 alloc] init];
crypt.HashAlgorithm = @"sha1";
crypt.EncodingMode = @"hexlower";

CkoStringBuilder *sbA = [[CkoStringBuilder alloc] init];
[sbA Append: @"timestamp.merchantid.orderid.amount.currency.cardnumber"];
int numReplaced = [[sbA Replace: @"timestamp" replacement: dtStr] intValue];
numReplaced = [[sbA Replace: @"merchantid" replacement: clientID] intValue];
numReplaced = [[sbA Replace: @"orderid" replacement: orderId] intValue];
numReplaced = [[sbA Replace: @"amount" replacement: amount] intValue];
numReplaced = [[sbA Replace: @"currency" replacement: currency] intValue];
numReplaced = [[sbA Replace: @"cardnumber" replacement: cardNumber] intValue];

NSString *hashA = [crypt HashStringENC: [sbA GetAsString]];

CkoStringBuilder *sbB = [[CkoStringBuilder alloc] init];
[sbB Append: hashA];
[sbB Append: @"."];
[sbB Append: sharedSecret];

NSString *hashB = [crypt HashStringENC: [sbB GetAsString]];

CkoXml *xml = [[CkoXml alloc] init];
xml.Tag = @"request";
[xml AddAttribute: @"type" value: @"auth"];
[xml AddAttribute: @"timestamp" value: dtStr];
[xml UpdateChildContent: @"merchantid" value: clientID];
[xml UpdateChildContent: @"account" value: @"internet"];
[xml UpdateChildContent: @"channel" value: @"ECOM"];
[xml UpdateChildContent: @"orderid" value: orderId];
[xml UpdateAttrAt: @"amount" autoCreate: YES attrName: @"currency" attrValue: currency];
[xml UpdateChildContent: @"amount" value: amount];
[xml UpdateChildContent: @"card|number" value: cardNumber];
[xml UpdateChildContent: @"card|expdate" value: @"0425"];
[xml UpdateChildContent: @"card|chname" value: @"James Mason"];
[xml UpdateChildContent: @"card|type" value: @"VISA"];
[xml UpdateChildContent: @"card|cvn|number" value: @"123"];
[xml UpdateChildContent: @"card|cvn|presind" value: @"1"];
[xml UpdateAttrAt: @"autosettle" autoCreate: YES attrName: @"flag" attrValue: @"1"];
[xml UpdateChildContent: @"sha1hash" value: hashB];

CkoHttpResponse *resp = [http PostXml: testUrl xmlDoc: [xml GetXml] charset: @"utf-8"];
if (http.LastMethodSuccess == NO) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

NSLog(@"%@%d",@"Response Status Code: ",[resp.StatusCode intValue]);

NSLog(@"%@",@"Response Body:");
NSLog(@"%@",resp.BodyStr);

if ([resp.StatusCode intValue] != 200) {
    NSLog(@"%@",@"Failed.");
    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"] intValue];
NSLog(@"%@%d",@"result = ",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) {
    NSLog(@"%@%@",@"authcode = ",[xml GetChildContent: @"authcode"]);
    NSLog(@"%@",@"Success.");

}
else {
    NSLog(@"%@",@"Failed.");
}