how to create curl commands on moodle - php

Question

I'm recently started developing on moodle and one big problem is that whenever i build a plugin with a web page, it don't execute any of my curl commands, i hear that moodle has his own php library(an php file called filelib.php i suppose) with curl commands and i should be using its commands instead of mine, but i don't have much experience with moodle development and php so all that code make me very confused.
i tried this question before and a gentleman helped me with an example, i tried his code and it didn't work(it changed the output but still show an error message, i also tried changing the code to no avail) and i didn't get much of an explanation about how curl commands work on moodle(i'm still grateful for his help) or whats commands on filelib.php will substitue my code, can someone help me?
my code:
<?php
require_once(__DIR__.'/../../config.php');
require_once($CFG->libdir.'/filelib.php');
$PAGE->set_url(new moodle_url(url:'/local/iesde/selecionaraulas.php'));
$PAGE->set_context(\context_system::instance());
$PAGE->set_title('selecionar aulas');
$PAGE->requires->js_call_amd('local_iesde/tabelas', 'init');
echo $OUTPUT->header();
echo $OUTPUT->render_from_template('local_iesde/manageaulas', $templatecontext);
$api_server = 'url';
$api_http_user = 'user';
$api_http_pass = 'pass';
$key_acess = 'key';
$key_name = 'API-KEY';
$format = 'json';
$params = array(
'IDstudent' => 000000,
'IDcourse' => 000000,
);
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, "{$api_server}/format/{$format}");
curl_setopt($curl, CURLOPT_HTTPAUTH, CURLAUTH_DIGEST);
curl_setopt($curl, CURLOPT_USERPWD, "{$api_http_user}:{$api_http_pass}");
curl_setopt($curl, CURLOPT_HTTPHEADER, array("{$key_name}:{$key_acess}"));
curl_setopt($curl, CURLOPT_NOBODY, 1);
curl_exec($curl);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl, CURLOPT_HEADER, 0);
curl_setopt($curl, CURLOPT_POST, 1);
curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query($params));
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0);
$output = curl_exec($curl);
var_dump(json_decode($output));
echo $output;
echo $OUTPUT->footer()
the purpose of this curl request is to print a list of ids that will be used on another curl request to generate a video file that will be executed on a videoplayer, the variables:
$api_server = 'url';
$api_http_user = 'user';
$api_http_pass = 'pass';
$key_acess = 'key';
$key_name = 'API-KEY';
$format = 'json';
$params = array(
'IDstudent' => 000000,
'IDcourse' => 000000,
);
Are all needed to execute the commands (one of the reasons i think the gentleman's example didn't work is that it didn't used all the variables of the code to get full validation).
well that is all, i'm very new to all of this so any explanation will help, thanks for the help.