using System.Security.Cryptography;
using System.Text;
using System;

GenerateRequestHash();
void GenerateRequestHash()
{
	string siteCode = "[YOUR SITE CODE]";
	string countryCode = "ZA";
	string currencyCode = "ZAR";
	decimal amount = 25.01M;
	string transactionReference = "123";
	string bankReference = "ABC123";
	string cancelUrl = "http://mydomain.com/cancel.html";
	string errorUrl = "http://mydomain.com/error.html";
	string successUrl = "http://mydomain.com/success.html";
	string notifyUrl = "http://mydomain/notify.html";
	string privateKey = "[YOUR PRIVATE KEY]";
	bool isTest = false;
	string inputString = string.Concat(siteCode, countryCode, currencyCode, amount, transactionReference, bankReference, cancelUrl, errorUrl, successUrl, notifyUrl, isTest, privateKey);
	string calculatedHashResult = GenerateRequestHashCheck(inputString);
	Console.WriteLine($"Hashcheck: {calculatedHashResult}");
}

string GenerateRequestHashCheck(string inputString)
{
	var stringToHash = inputString.ToLower();
	Console.WriteLine($"Before Hashcheck: {stringToHash}");
	return GetSha512Hash(stringToHash);
}

string GetSha512Hash(string stringToHash)
{
	using (SHA512 alg = new SHA512CryptoServiceProvider())
	{
		var bytes = alg.ComputeHash(Encoding.UTF8.GetBytes(stringToHash));
		var sb = new StringBuilder();
		foreach (var b in bytes)
		{
			var hex = b.ToString("x2");
			sb.Append(hex);
		}

		return sb.ToString();
	}
}

<?php

function generate_request_hash() {
    $siteCode = "[YOUR SITE CODE]";
    $countryCode = "ZA";
    $currencyCode = "ZAR";
    $amount = 25.01;
    $transactionReference = "123";
    $bankReference = "ABC123";
    $cancelUrl = "http://mydomain.com/cancel.html";
    $errorUrl = "http://mydomain.com/error.html";
    $successUrl = "http://mydomain.com/success.html";
    $notifyUrl = "http://mydomain/notify.html";
    $privateKey = "[YOUR PRIVATE KEY]";
    $isTest = "false";
    
    $inputString = $siteCode . $countryCode . $currencyCode . $amount . $transactionReference . $bankReference . $cancelUrl . $errorUrl . $successUrl . $notifyUrl . $isTest . $privateKey;
    
    $calculatedHashResult = generate_request_hash_check($inputString);
    echo "Hashcheck: " . $calculatedHashResult . "\n";
}

function generate_request_hash_check($inputString) {
    $stringToHash = strtolower($inputString);
    echo "Before Hashcheck: " . $stringToHash . "\n";
    return get_sha512_hash($stringToHash);
}

function get_sha512_hash($stringToHash) {
    $bytes = hash('sha512', $stringToHash, true);
    $hex = bin2hex($bytes);
    return $hex;
}

generate_request_hash();

?>

const crypto = require("crypto");

function generateRequestHash() {
  const siteCode = "[YOUR SITE CODE]";
  const countryCode = "ZA";
  const currencyCode = "ZAR";
  const amount = 25.01;
  const transactionReference = "123";
  const bankReference = "ABC123";
  const cancelUrl = "http://mydomain.com/cancel.html";
  const errorUrl = "http://mydomain.com/error.html";
  const successUrl = "http://mydomain.com/success.html";
  const notifyUrl = "http://mydomain/notify.html";
  const privateKey = "[YOUR PRIVATE KEY]";
  const isTest = false;

  const inputString = `${siteCode}${countryCode}${currencyCode}${amount}${transactionReference}${bankReference}${cancelUrl}${errorUrl}${successUrl}${notifyUrl}${isTest}${privateKey}`;

  const calculatedHashResult = generateRequestHashCheck(inputString);
  console.log(`Hashcheck: ${calculatedHashResult}`);
}

function generateRequestHashCheck(inputString) {
  const stringToHash = inputString.toLowerCase();
  console.log(`Before Hashcheck: ${stringToHash}`);
  return getSha512Hash(stringToHash);
}

function getSha512Hash(stringToHash) {
  const hash = crypto.createHash("sha512");
  hash.update(stringToHash);
  return hash.digest("hex");
}

generateRequestHash();

import hashlib
import string

def generate_request_hash():
    site_code = '[YOUR SITE CODE]'
    country_code = 'ZA'
    currency_code = 'ZAR'
    amount = 25.01
    transaction_reference = '123'
    bank_reference = 'ABC123'
    cancel_url = 'http://mydomain.com/cancel.html'
    error_url = 'http://mydomain.com/error.html'
    success_url = 'http://mydomain.com/success.html'
    notify_url = 'http://mydomain/notify.html'
    private_key = '[YOUR PRIVATE KEY]'
    is_test = False

    input_string = site_code + country_code + currency_code + str(amount) + transaction_reference + bank_reference + cancel_url + error_url + success_url + notify_url + str(is_test) + private_key
    input_string = input_string.lower()
    calculated_hash_result = generate_request_hash_check(input_string)
    print(f"Hashcheck: {calculated_hash_result}")

def generate_request_hash_check(input_string):
    print(f"Before Hashcheck: {input_string}")
    return get_sha512_hash(input_string)

def get_sha512_hash(input_string):
    sha = hashlib.sha512()
    sha.update(input_string.encode())
    return sha.hexdigest()

generate_request_hash()

<?php

$curl = curl_init();

$data = [
    "countryCode" => "ZA",
    "amount" => "0.01",
    "transactionReference" => "Test1",
    "bankReference" => "Test1",
    "cancelUrl" => "http://test.i-pay.co.za/responsetest.php",
    "currencyCode" => "ZAR",
    "errorUrl" => "http://test.i-pay.co.za/responsetest.php",
    "isTest" => false,
    "notifyUrl" => "http://test.i-pay.co.za/responsetest.php",
    "siteCode" => "[YOUR SITECODE]",
    "successUrl" => "http://test.i-pay.co.za/responsetest.php",
    "hashCheck" => "[GENERATED HASH]"
];

curl_setopt_array($curl, array(
  CURLOPT_URL => 'https://api.ozow.com/postpaymentrequest',
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => '',
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 0,
  CURLOPT_FOLLOWLOCATION => true,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => 'POST',
  CURLOPT_POSTFIELDS => json_encode($data),
  CURLOPT_HTTPHEADER => array(
    'Accept: application/json',
    'ApiKey:[API KEY HERE]',
    'Content-Type: application/json'
  ),
));

$response = curl_exec($curl);

curl_close($curl);
echo $response;

?>

var client = new RestClient("https://api.ozow.com/postpaymentrequest");
client.Timeout = -1;
var request = new RestRequest(Method.POST);
request.AddHeader("Accept", "application/json");
request.AddHeader("ApiKey", "[API KEY HERE]");
request.AddHeader("Content-Type", "application/json");

var data = new
{
	countryCode = "ZA",
	amount = "0.01",
	transactionReference = "Test1",
	bankReference = "Test1",
	cancelUrl = "http://test.i-pay.co.za/responsetest.php",
	currencyCode = "ZAR",
	errorUrl = "http://test.i-pay.co.za/responsetest.php",
	isTest = false,
	notifyUrl = "http://test.i-pay.co.za/responsetest.php",
	siteCode = "[YOUR SITECODE]",
	successUrl = "http://test.i-pay.co.za/responsetest.php",
	hashCheck = "[GENERATED HASH]"
};

var json = JsonConvert.SerializeObject(data);
request.AddParameter("application/json", json, ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
Console.WriteLine(response.Content);

import json
import requests

url = "https://api.ozow.com/postpaymentrequest"

headers = {
	"Accept": "application/json",
	"ApiKey": "[API KEY HERE]",
	"Content-Type": "application/json"
	}
	
data = {
	"countryCode": "ZA",
	"amount": "0.01",
	"transactionReference": "Test1",
	"bankReference": "Test1",
	"cancelUrl": "http://test.i-pay.co.za/responsetest.php",
	"currencyCode": "ZAR",
	"errorUrl": "http://test.i-pay.co.za/responsetest.php",
	"isTest": False,
	"notifyUrl": "http://test.i-pay.co.za/responsetest.php",
	"siteCode": "[YOUR SITECODE]",
	"successUrl": "http://test.i-pay.co.za/responsetest.php",
	"hashCheck": "[GENERATED HASH]"
	}

response = requests.post(url, headers=headers, json=data)

print(response.text)

const data = {
	countryCode: "ZA",
	amount: "0.01",
	transactionReference: "Test1",
	bankReference: "Test1",
	cancelUrl: "http://test.i-pay.co.za/responsetest.php",
	currencyCode: "ZAR",
	errorUrl: "http://test.i-pay.co.za/responsetest.php",
	isTest: false,
	notifyUrl: "http://test.i-pay.co.za/responsetest.php",
	siteCode: "[YOUR SITECODE]",
	successUrl: "http://test.i-pay.co.za/responsetest.php",
	hashCheck: "[GENERATED HASH]"
};

const options = {
	method: 'POST',
	headers: {
	'Accept': 'application/json',
	'ApiKey': '[API KEY HERE]',
	'Content-Type': 'application/json',
	},
	body: JSON.stringify(data)
};

fetch('https://api.ozow.com/postpaymentrequest', options)
.then(response => response.text())
.then(data => console.log(data))
.catch(error => console.error(error));

{
    "paymentRequestId": "00000000-0000-0000-0000-000000000000",
    "url": "https://pay.ozow.com/00000000-0000-0000-0000-000000000000/Secure",
    "errorMessage": null
}