How do I submit Data as Form-Data with cUrl - php

Question

I have to send Data to an Api via PHP cUrl and then save the Token I get as a response.
In postman in works when I send the data as Form-data, but not if I send it as raw body. I now try to send the data via cUrl but I get the same response I get when I use postman with raw-body. How do I post it as form data?
Thanks
I tried those:
try:
$body = array();
$body['userEmail'] = $email;
$body['userPassword'] = $password;
$body['clientId'] = 'Kursapp';
$data_string = json_encode($body);
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_HTTPHEADER, array(
'Accept: application/json;charset=UTF-8',
'Content-Type: application/json;charset=UTF-8'
));
curl_setopt($curl, CURLOPT_POSTFIELDS, $data_string);
$response = curl_exec($curl);
curl_close ($curl);
try:
$body = array();
$body['userEmail'] = $email;
$body['userPassword'] = $password;
$body['clientId'] = 'Kursapp';
$data_string = http_build_query($body);
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_HTTPHEADER, array(
'Accept: application/json;charset=UTF-8',
'Content-Type: application/json;charset=UTF-8'
));
curl_setopt($curl, CURLOPT_POSTFIELDS, $data_string);
$response = curl_exec($curl);
curl_close ($curl);
try
$body = array();
$body['userEmail'] = $email;
$body['userPassword'] = $password;
$body['clientId'] = 'Kursapp';
$post_str ='';
foreach ($body as $key=>$value){
$post_str .= $key.'='.urldecode($value).'&';
}
$post_str = substr($post_str, 0, -1);
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_HTTPHEADER, array(
'Accept: application/json;charset=UTF-8',
'Content-Type: application/json;charset=UTF-8'
));
curl_setopt($curl, CURLOPT_POSTFIELDS, $postr);
$response = curl_exec($curl);
curl_close ($curl);
try with guzzle
$client = new Client();
$response = $client->request('POST', $url, [
'headers' => [
'Accept' => 'application/json;charset=UTF-8',
'Content-Type' => 'application/json;charset=UTF-8'
],
'form_params' => $body
]);