<?php include '../vendor/autoload.php'; $server = ['id' => 'xxxxxx', 'token' => 'abcdef']; $ms = new SquareMS\Api($server['id'], $server['token']); $mail = new SquareMS\Mail(['from' => '', 'to' => '', 'subject' => 'Hello World !', 'contents' => ['text' => 'Mail text !', 'html' => 'Mail html !']]); var_dump($ms->sendmail($mail));