[SOLVED] Log: "Missing required user data" after executing a PHP function

use Appwrite\ID;
...
$users->create(ID::unique(), $email,null, $password, $name);

  if (empty($name) || empty($email) || empty($password)) {
        return $res->send('Missing required user data: name, email, password', 400);
    }

try {
 $userData = \json_decode($req['payload'], true);
} catch(\Exception $err) {
 $res->json([
  'success' => false,
  'message' => 'Payload is invalid.',
 ]);
 return;
}

<?php

use Appwrite\Client;
use Appwrite\Services\Users;
use Appwrite\Services\Functions;
use Appwrite\ID;

require_once 'vendor/autoload.php';

return function ($req, $res) {
    $client = new Client();
    $users = new Users($client);

    if (
        !$req['variables']['APPWRITE_FUNCTION_ENDPOINT']
        || !$req['variables']['APPWRITE_FUNCTION_API_KEY']
        || !$req['variables']['APPWRITE_FUNCTION_PROJECT_ID']
    ) {
        return $res->send('Environment variables are not set. Function cannot use Appwrite SDK.', 500);
    }

    $client
        ->setEndpoint($req['variables']['APPWRITE_FUNCTION_ENDPOINT'])
        ->setProject($req['variables']['APPWRITE_FUNCTION_PROJECT_ID'])
        ->setKey($req['variables']['APPWRITE_FUNCTION_API_KEY'])
        ->setSelfSigned(true);

    // Debug code: Log the received payload
    error_log('Received payload:');
    error_log(print_r($req, true));

    // Correctly access the user data from the payload
    try {
     $userData = \json_decode($req['payload'], true);
    } catch(\Exception $err) {
     $res->json([
      'success' => false,
      'message' => 'Payload is invalid.',
     ]);
     return;
    }

    // Retrieve the user data fields from the payload
    $userId = $userData['userid'] ?? '';
    $name = $userData['name'] ?? '';
    $email = $userData['email'] ?? '';
    $password = $userData['password'] ?? '';

    // Check for missing user data fields
    if (empty($name) || empty($email) || empty($password)) {
        return $res->send('Missing required user data: name, email, password', 400);
    }

    try {
        $user = $users->create(ID::unique(), $email, null, $password, $name);
        $userId = $user['$id'] ?? ''; // Retrieve the generated user ID
    } catch (AppwriteException $error) {
        echo $error->getMessage();
        return;
    }

    $user = [
        'userid' => ID::unique(),
        'name' => $name,
        'email' => $email,
        'password' => $password
    ];

    return $res->json(['user' => $user]);
};