(Objective-C) Duplicate curl -u user:password with Chilkat HTTP

Demonstrates how to duplicate a curl command that uses the -u username:password option. (This assumes HTTP Basic Authentication, and Chilkat requires Basic authentication to be over a TLS connection.)

Duplicates the following curl command:

curl https://api.sandbox.paypal.com/v1/oauth2/token \
  -H "Accept: application/json" \
  -H "Accept-Language: en_US" \
  -u "Client-Id:Secret" \
  -d "grant_type=client_credentials"

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#import <CkoHttp.h>
#import <CkoHttpRequest.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];
CkoHttpRequest *req = [[CkoHttpRequest alloc] init];

// The AddHeader method corresponds to the curl "-H" argument.
[req AddHeader: @"Accept" value: @"application/json"];
[req AddHeader: @"Accept-Language" value: @"en_US"];

// The curl "-d" argument specifies the HTTP request body.  In this case,
// we're sending an application/x-www-form-urlencoded request, and therefore
// the body contains the URL-encoded query parameters.
[req AddParam: @"grant_type" value: @"client_credentials"];

http.Login = @"PAYPAL_REST_API_CLIENT_ID";
http.Password = @"PAYPAL_REST_API_SECRET";

// Sends a POST request where the Content-Type is application/x-www-form-urlencoded
CkoHttpResponse *resp = [http PostUrlEncoded: @"https://api.sandbox.paypal.com/v1/oauth2/token" req: req];
if (http.LastMethodSuccess != YES) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

if ([resp.StatusCode intValue] != 200) {
    NSLog(@"%@%d",@"Error status code: ",[resp.StatusCode intValue]);
    NSLog(@"%@",resp.BodyStr);

    return;
}

// The JSON response is in the resp BodyStr property
NSLog(@"%@",resp.BodyStr);
NSLog(@"%@",@"-- Success.");