<?php

$user = [
    'user_email' => 'mon@email.com',
    'user_ip' => '127.1.2.3'
];

$url = 'https://www.proche2moi.com/gateway/billing.php?ida=1360&id_product=29&offer=dating2&rebill=0&comfrom=catcher60&main_id_cat=50&tracker=&user_email=&user_ip_address=&user_is_male=&user_nickname=&user_password=&user_birthdate=&user_age=&user_age_range=&user_city=&user_search_age_range=&user_search_male=&user_search_female=';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $user);
curl_setopt($ch, CURLOPT_HTTPHEADER, [
    'Accept: application/json',
    sprintf('X-Forwarded-For: %s', $user['user_ip']),
]);
$data = curl_exec($ch);
$json = json_decode($data);

if (!$json && json_last_error())
    throw new RuntimeException(json_last_error_msg());

elseif ($json && !empty($json->error))
    throw new RuntimeException($json->error);

$redirect_url = $json->url;
var_dump($redirect_url);

?>