PHP API load testing

<?php
require __DIR__ . '/vendor/autoload.php';

use VoltTest\DataSourceConfiguration;
use VoltTest\VoltTest;

$test = new VoltTest('API Load Test');
$test->setVirtualUsers(200)->setDuration('5m')->setRampUp('30s');

$scenario = $test->scenario('Orders API');

// every virtual user takes one unique row from the CSV
$scenario->setDataSourceConfiguration(
    new DataSourceConfiguration(__DIR__ . '/users.csv', 'unique', true)
);

// 1. authenticate, keep the token per virtual user
$scenario->step('Login')
    ->post('https://api.example.com/login',
        '{"email":"${email}","password":"${password}"}')
    ->header('Content-Type', 'application/json')
    ->validateStatus('logged in', 200)
    ->extractFromJson('token', '$.data.access_token');

// 2. reuse it on an authenticated write
$scenario->step('Create order')
    ->post('https://api.example.com/orders', '{"sku":"${sku}"}')
    ->header('Authorization', 'Bearer ${token}')
    ->header('Content-Type', 'application/json')
    ->validateStatus('created', 201)
    ->extractFromJson('orderId', '$.data.id')
    ->setThinkTime('2s');

// 3. read it back as the same user
$scenario->step('Fetch order')
    ->get('https://api.example.com/orders/${orderId}')
    ->header('Authorization', 'Bearer ${token}')
    ->validateStatus('ok', 200);

$result = $test->run(true);
echo $result->getP95ResponseTime();