How to send emails with PHP

There is no official PHP SDK — call the Publiq REST API with Guzzle (or cURL). Send from the server with the API key in the header.

With Guzzle (composer require guzzlehttp/guzzle):

<?php
use GuzzleHttp\Client;

$client = new Client();
$res = $client->post('https://api.publiq.digital/v1/emails', [
    'headers' => ['Authorization' => 'Bearer ' . getenv('PUBLIQ_API_KEY')],
    'json' => [
        'from' => 'you@yourdomain.com',
        'to' => 'user@example.com',
        'templateKey' => 'welcome-email',
        'variables' => ['first_name' => 'Ana'],
    ],
]);

$email = json_decode($res->getBody(), true);
echo $email['id'];

Best practices

Always call Publiq from the server — the API key goes in the Authorization header, never on the client.
On 429/5xx, retry with exponential backoff (respect Retry-After).
Prefer templateKey over inline HTML to keep content versioned.
Handle errors via the response error.code field — see Errors.
Send from a verified domain — see Domains.