Refactor the Handler to send emails

gistfile1.txt

php
private \SendGrid\Mail\Mail $mail;
private \SendGrid $mailer;
private array $config;

public function __construct(
    \SendGrid\Mail\Mail $mail,
    \SendGrid $mailer,
    array $config
) {
    $this->mail = $mail;
    $this->mailer = $mailer;
    $this->config = $config;
}