Running PHP API call without Page Reloading - php

Question

I have a multistep form (HTML / JS / PHP) and the form data gets sent to a backend after submitting, which results in a page reload.
Is it possible to pass the data live to the backend when the user gets to a new page of the form (clicks on the next button)?
<?php
require_once dirname(__FILE__) . '/MailWizzApi/Autoloader.php';
MailWizzApi_Autoloader::register();
// configuration object
$config = new MailWizzApi_Config(array(
'apiUrl' => 'http://email.mddasd.de/api/index.php',
'publicKey' => 'SAMPLEKEY',
'privateKey' => 'SAMPLEKEY',
// components
'components' => array(
'cache' => array(
'class' => 'MailWizzApi_Cache_File',
'filesPath' => dirname(__FILE__) . '/MailWizzApi/Cache/data/cache', // make sure it is writable by webserver
)
),
));
// now inject the configuration and we are ready to make api calls
MailWizzApi_Base::setConfig($config);
// start UTC
date_default_timezone_set('UTC');
$email = $_POST ['email'];
$name = $_POST['name'];
$phone = $_POST['telephone'];
if (isset($_POST['branch_0_answers']) && $_POST['branch_0_answers'] != "")
{
foreach($_POST['branch_0_answers'] as $value)
{
$art.= trim(stripslashes($value)) . "\n";
};
$grundflaeche .= $_POST['grundflaeche-grundstueck'] . "\n";
$plz .= $_POST['plz'] . "\n";
}
if (isset($_POST['branch_1_answers']) && $_POST['branch_1_answers'] != "")
{
foreach($_POST['branch_1_answers'] as $value)
{
$art.= trim(stripslashes($value)) . "\n";
};
$wohnflaeche .= $_POST['wohnflaeche-haus'] . "\n";
$grundflaeche .= $_POST['grundflaeche-haus'] . "\n";
$baujahr .= $_POST['baujahr'] . "\n";
$plz .= $_POST['plz'] . "\n";
}
if (isset($_POST['branch_2_answers']) && $_POST['branch_2_answers'] != "")
{
foreach($_POST['branch_2_answers'] as $value)
{
$art.= trim(stripslashes($value)) . "\n";
};
$wohnflaeche .= $_POST['wohnflaeche-wohnung'] . "\n";
$baujahr .= $_POST['baujahr'] . "\n";
$plz .= $_POST['plz'] . "\n";
}
if (isset($_POST['branch_3_answers']) && $_POST['branch_3_answers'] != "")
{
foreach($_POST['branch_3_answers'] as $value)
{
$art.= trim(stripslashes($value)) . "\n";
};
$gewerbeflaeche .= $_POST['gewerbeflaeche'] . "\n";
$grundflaeche .= $_POST['grundflaeche-gewerbe'] . "\n";
$baujahr .= $_POST['baujahr'] . "\n";
$plz .= $_POST['plz'] . "\n";
}
foreach($_POST['branch_1_1_answers'] as $value)
{
$stand.= trim(stripslashes($value)) . "\n";
};
$endpoint = new MailWizzApi_Endpoint_ListSubscribers();
$response = $endpoint->create('ma503j6m97b75', array(
'EMAIL' => $email,
'TELEFON' => $phone,
'NAME' => $name,
'ART' => $art,
'GEWERBEFLAECHE' => $gewerbeflaeche,
'WOHNFLAECHE' => $wohnflaeche,
'GRUNDFLAECHE' => $grundflaeche,
'BAUJAHR' => $baujahr,
'PLZ' => $plz,
'STAND' => $stand
));
?>
The .php gets executed with the final submit button.
Thanks for your answers.