Trying to figure out how to interface with the PayGate API - reactjs

Question

I can see that these are the parameters required when I make a call to the payment gateway API, but I have no idea how I would implement this in Javascript (specifically React). Any translators able to lend a hand?
Here is the example code in PHP:
$encryptionKey = 'secret';
$DateTime = new DateTime();
$data = array(
'PAYGATE_ID' => 10011072130,
'REFERENCE' => 'pgtest_123456789',
'AMOUNT' => 3299,
'CURRENCY' => 'ZAR',
'RETURN_URL' => 'https://my.return.url/page',
'TRANSACTION_DATE' => $DateTime->format('Y-m-d H:i:s'),
'LOCALE' => 'en-za',
'COUNTRY' => 'ZAF',
'EMAIL' => 'customer#paygate.co.za',
);
$checksum = md5(implode('', $data) . $encryptionKey);
$data['CHECKSUM'] = $checksum;
$fieldsString = http_build_query($data);
//open connection
$ch = curl_init();
//set the url, number of POST vars, POST data
curl_setopt($ch, CURLOPT_URL, 'https://secure.paygate.co.za/payweb3/initiate.trans');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_NOBODY, false);
curl_setopt($ch, CURLOPT_REFERER, $_SERVER['HTTP_HOST']);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $fieldsString);
//execute post
$result = curl_exec($ch);
//close connection
curl_close($ch);
I have been trying to use axios to make the request, but any method will do. I was trying to create an axios instance like so:
export default axios.create({
baseURL: 'https://secure.paygate.co.za/payweb3/initiate.trans',
headers:{
//I guess this is where PAYGATE_ID etc would go, but I'm not sure how to format it
}
})```

Answer 1

For React, the way to handle this is to generate an MD5 checksum and append it to the payload before sending, probably using CryptoJS or something. I created this function to generate the MD5:
const generateMD5 = (obj, secret = 'paygateSecret') => {
let str = ''
for (let val in obj){
str += obj[val]
}
str += secret
return CryptoJS.MD5(str).toString()
}
I have an object that contains my data:
var data = {
PAYGATE_ID: 10011072130,
REFERENCE: ref,
AMOUNT: amount,
CURRENCY: 'ZAR',
RETURN_URL: window.location.href,
TRANSACTION_DATE: new Date().toISOString(),
LOCALE: 'en-za',
COUNTRY: 'ZAF',
EMAIL: email,
}
Please note the order. It is very important.
Then, I generate the checksum using:
const CHECKSUM = generateMD5(data)
And then make the axios call:
axios.post('https://secure.paygate.co.za/payweb3/initiate.trans', { ...data, CHECKSUM }).then(...).catch(...)
I think this should work!