composer require mailofly/mailofly

<?php

use Mailofly\Client;
use Mailofly\MailoflyException;

$client = new Client(
    getenv('MAILOFLY_API_KEY'),
    // 'https://www.mailofly.com', // optional baseUrl
);

try {
    $result = $client->emails->send([
        'from' => 'Acme <onboarding@example.com>',
        'to' => ['alex@example.com'],
        'subject' => 'Hello',
        'html' => '<p>Thanks for signing up.</p>',
    ]);
    echo $result['id'];
} catch (MailoflyException $e) {
    fwrite(STDERR, "{$e->status} {$e->error} {$e->detailMessage}\n");
    throw $e;
}

$client->emails->send([
    'from' => 'Acme <onboarding@example.com>',
    'to' => ['alex@example.com'],
    'template' => [
        'id' => 'uuid-of-template',
        'variables' => ['first_name' => 'Alex'],
    ],
]);

$result = $client->batch->send([
    [
        'from' => 'Acme <onboarding@example.com>',
        'to' => ['foo@example.com'],
        'subject' => 'hello world',
        'html' => '<h1>it works!</h1>',
    ],
    [
        'from' => 'Acme <onboarding@example.com>',
        'to' => ['bar@example.com'],
        'subject' => 'world hello',
        'html' => '<p>it works!</p>',
    ],
]);

$accounts = $client->accounts->list();

$client->contacts->create([
    'email' => 'alex@example.com',
    'first_name' => 'Alex',
    'custom_fields' => ['plan' => 'pro'],
]);

$client->campaigns->send('campaign-uuid', ['send_now' => true]);

$logs = $client->mailLogs->list(['page' => 1, 'page_size' => 50, 'status' => 'failed']);

$meta = Client::discovery();
print_r($meta);

try {
    $client->accounts->list();
} catch (MailoflyException $e) {
    // $e->status, $e->error, $e->detailMessage
}