How to connect with 2ba it's API using PHP - php

Question

Im trying to connect to the API services of 2ba. Somehow I just can't connect. I get the error: error: "invalid_client"
I dont know what to try, it feels like I need to hash my cliend_secret or complete url but I dont see that in the documentation.
This is my code (PHP):
<?php
// ---- GET TOKEN ----
// Base url for all api calls.
$baseURL = 'https://authorize.2ba.nl';
// Specified url endpoint. This comes after the baseUrl.
$endPoint = '/OAuth/Token';
// Parameters that are required or/and optianal for the endPoint its request.
$parameters = 'grant_type=password&username=abc#abc.com&password=123abc&client_id=myClientID&client_secret=myClientSecret';
// All parts together.
$url = $baseURL . $endPoint . '?' . $parameters;
//Init session for CURL.
$ch = curl_init();
// Options
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
// Init headers for access to the binance API signed data.
$headers = array();
$headers[] = 'Content-type: application/x-www-form-urlencoded';
$headers[] = 'Content-Length: 0';
// Setting headers
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
// Execute request.
$data = curl_exec($ch);
// If there is an error. Show whats wrong.
if (curl_errno($ch)) {
echo 'Error:' . curl_error($ch);
}
// Ends the CURL session, frees all resources and deletes the curl (ch).
curl_close($ch);
$result = json_encode($data);
echo($data);
exit();
?>
The authentication is oauth2 and I want to use the "Password Grant" flow since I can login automaticly this way. Also I see in the example code in C# that they encode the url, something im not doing yet but did try. It did not work.
// Using $encodedUrl like this: curl_setopt($ch, CURLOPT_URL, $encodedUrl); but does not work.
$encodedUrl = urlencode($url);

Answer 1

Alright so I fixed it. I now got my access token and am able to recieve data from the API. This is what I did:
// ---- GET TOKEN - FLOW: USER PSW ----
// No changes
$baseURL = 'https://authorize.2ba.nl';
// No changes
$endPoint = '/OAuth/Token';
// $parameters is now an array.
$parameters = array(
'grant_type' => 'password',
'username' => 'myUsername',
'password' => 'myPassword',
'client_id' => 'myClientID',
'client_secret' => 'myClientSecret'
);
// Removed the $parameter part
$url = $baseURL . $endPoint;
//Init session for CURL.
$ch = curl_init();
// Init headers for access to the binance API signed data.
$headers = array();
$headers['Content-Type'] = "application/x-www-form-urlencoded";
// NOTE: http_build_query fixed it.
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($parameters)); // Automaticly encodes parameters like client_secret and id.
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
// Execute request.
$data = curl_exec($ch);
// If there is an error. Show whats wrong.
if (curl_errno($ch)) {
echo 'Error:' . curl_error($ch);
}
// Ends the CURL session, frees all resources and deletes the curl (ch).
curl_close($ch);
$result = json_encode($data);
echo($data);
exit();