(Objective-C) CardConnect Void

Demonstrates how to send a CardConnect void request.

The void service cancels a transaction that is in either "Authorized" or "Queued for Capture" status.. ...

See https://developer.cardconnect.com/cardconnect-api#void

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#import <CkoHttp.h>
#import <CkoJsonObject.h>
#import <NSString.h>

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

CkoHttp *http = [[CkoHttp alloc] init];
BOOL success;

http.BasicAuth = YES;
http.Login = @"API_USERNAME";
http.Password = @"API_PASSWORD";

// Build and send the following JSON:

// The "retref" is the value returned in the JSON response for the Authorization request.

// {
//     "retref":"112989260941",
//     "merchid":"MERCHANT_ID"
// }

CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json UpdateString: @"retref" value: @"112989260941"];
[json UpdateString: @"merchid" value: @"MERCHANT_ID"];

NSString *url = @"https://<site>.cardconnect.com:<port>/cardconnect/rest/void";
NSString *responseStr = [http PutText: url textData: [json Emit] charset: @"utf-8" contentType: @"application/json" md5: NO gzip: NO];
if (http.LastMethodSuccess == NO) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

// A response status of 200 indicates potential success.  The JSON response body
// must be examined to determine if it was truly successful or an error.
NSLog(@"%@%d",@"response status code = ",[http.LastStatus intValue]);

CkoJsonObject *jsonResp = [[CkoJsonObject alloc] init];
[jsonResp Load: responseStr];
jsonResp.EmitCompact = NO;

NSLog(@"%@",@"response JSON:");
NSLog(@"%@",[jsonResp Emit]);

// A successful response looks like this:

// {
//   "authcode": "REVERS",
//   "respproc": "FNOR",
//   "amount": "0.00",
//   "resptext": "Approval",
//   "currency": "USD",
//   "retref": "112989260941",
//   "respstat": "A",
//   "respcode": "00",
//   "merchid": "496160873888"
// }

// Use this online tool to generate parsing code from sample JSON: 
// Generate Parsing Code from JSON

NSString *authcode = [jsonResp StringOf: @"authcode"];
NSString *respproc = [jsonResp StringOf: @"respproc"];
NSString *amount = [jsonResp StringOf: @"amount"];
NSString *resptext = [jsonResp StringOf: @"resptext"];
NSString *currency = [jsonResp StringOf: @"currency"];
NSString *retref = [jsonResp StringOf: @"retref"];
NSString *respstat = [jsonResp StringOf: @"respstat"];
NSString *respcode = [jsonResp StringOf: @"respcode"];
NSString *merchid = [jsonResp StringOf: @"merchid"];