Error while making payments using Mollie API in php - php

Question

I am making payments using mollie API in php. But its giving me some errors . I have posted my code and screenshot of the errors.
THIS IS MY CODE:
<?php
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);
try {
require_once "vendor/autoload.php";
$mollie = new \Mollie\Api\MollieApiClient();
$mollie->setApiKey("test_XXXX");
$orderId = time();
$amount = $_POST['amount'];
$payment = $mollie->payments->create([
"amount" => [
"currency" => "EUR",
"value" => "$amount", // You must send the correct number of decimals, thus we enforce the use of strings
],
"description" => "Order #{$orderId}",
"redirectUrl" => "https://example.com/Mollie/return/".$orderId."/",
"webhookUrl" => "https://example.com/Mollie/webhook/",
"metadata" => [
"order_id" => $orderId,
],
]);
print_r($payment);
$payment_data = array(
'payment_id' => $payment->id,
'user_id' => $_POST['user_id'],
'order_id' => $orderId,
'mode' => $payment->mode,
'description' => $payment->description,
'status' => $payment->status,
'added_date' => date('Y-m-d'),
'added_time' => date('H:i:s')
);
print_r($payment_data);
header("Location: " . $payment->getCheckoutUrl(), true, 303);
} catch (\Mollie\Api\Exceptions\ApiException $e) {
echo "API call failed: ". htmlspecialchars($e->getMessage());
}
THE SCREENSHOT:
The first image shows "Uncaught SyntaxError: Unexpected token M in JSON at position 0" in RED color.
The second image is the warning I am getting
First image
Second Image