Simplest code for creating a post request

//
//  main.m
//  RequestToWindcave2
//
//  Created by Developer on 18/01/21.
//  Copyright © 2021 Developer. All rights reserved.
//

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        NSMutableDictionary *requestMap = [[NSMutableDictionary alloc] initWithCapacity:32];
        requestMap[@"type"] = @"purchase";
        requestMap[@"amount"] = @"10.00";
        requestMap[@"currency"] = @"NZD";
        requestMap[@"card"] = @{
                @"cardNumber": @"4111111111111111",
                @"dateExpiryYear": @"23",
                @"dateExpiryMonth": @"10",
                @"cvc2": @"000"
        };
        
        NSData *requestBodyData = [NSJSONSerialization dataWithJSONObject:requestMap options:0 error:nil];
        
        NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"https://dev.windcave.com/api/v1/transactions"] cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:60.0];
        
        [request setHTTPMethod: @"POST"];
        [request setValue: @"application/json" forHTTPHeaderField: @"content-type"];
        [request setValue: @"Basic SGFqaW5LOjVlZGYzNzIyZmFjMjE1M2IwYzRmZjQyOGM2MDM5MjYwNjE5ZDI0N2M3Yzc3YWQ0Mzc5MThkZDUwNDMyMTc1MmU=" forHTTPHeaderField:@"Authorization"];
        [request setHTTPBody: requestBodyData];
        
        NSURLSession *session = [NSURLSession sharedSession];
        NSURLSessionDataTask *dataTask = [session
                                          dataTaskWithRequest:request
                                          completionHandler:^(NSData *data, NSURLResponse *response, NSError *error){
            NSDictionary *dictionary = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];
            NSLog(@"%@", dictionary);
            
            
        }];
        [dataTask resume];
        while(true){}
    }
    return 0;
}