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PHP - How To Create Session with cURL?

I've developed an API function with php to make a user login from siteA to siteB. siteA-login.php

$url = "https://api.siteb.com/login";
$cookie = "cookie-api.txt";
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $url);
//curl_setopt($curl, CURLOPT_POST, 1);
curl_setopt($curl, CURLOPT_POSTFIELDS, "data=".json_encode($curlPost));
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl, CURLOPT_COOKIEJAR, $cookie);
curl_setopt($curl, CURLOPT_COOKIEFILE, $cookie);
curl_setopt($curl, CURLOPT_REFERER, $url);
$response = (curl_exec($curl));
curl_close($curl);

header("location: https://siteb.com/restricted-content");

This is siteb where I login the user with CI4:

$session = session();
$session - > set(array('user' => $user));

However after the redirect I go to login page and not in the restricted content. How can I solve?

Solution:

You can't set Cookies for other domain as you are on.

maybe you can try something like this:

User try to login
API request from A to B to get a Key ( remembered in Database Site B )
Redirect User with this Key to Site B ( query in Database if key correct )
Login User, delete Key to prevent second usage