How do I connect my PHP code to Heroku's addon 'SendGrid'? - php

Question

I purchased a template that included a PHP contact form using AJAX I'm using Heroku to deploy my web application,(my portfolio), and SendGrid as my add-on in order to send API-driven emails from my portfolio. When I submit my form, I get a '500: Internal Server Error', so my question is, how to I integrate SendGrid into the PHP code I already have?
I'm unfamiliar with PHP and during research I did download composer and these files were automated:
- A vender folder
-composer.json file
-composer.lock file
Here is my Repo: https://github.com/Mendiolac/Portfolio
Here is my Portfolio link: https://cm-portfolio.herokuapp.com/
I tried the SMTP route where SendGrip gives you the steps to configure your application by connecting it their server and when I tested it was unsuccessful without an error message.
<?php
require '../vendor/autoload.php';
if(!isset($_SERVER['HTTP_X_REQUESTED_WITH']) AND strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) != 'xmlhttprequest') {
die('Sorry Request must be Ajax POST');
}
if(isset($_POST)) {
$name = filter_var($_POST["name"], FILTER_SANITIZE_STRING);
$email = filter_var($_POST["email"], FILTER_SANITIZE_EMAIL);
$subject = filter_var($_POST["subject"], FILTER_SANITIZE_STRING, FILTER_FLAG_NO_ENCODE_QUOTES);
$message = filter_var($_POST["message"], FILTER_SANITIZE_STRING);
if(!$contact_email_to || $contact_email_to == 'contact#example.com') {
die('The contact form receiving email address is not configured!');
}
if(strlen($name)<3){
die($contact_error_name);
}
if(!$email){
die($contact_error_email);
}
if(strlen($subject)<3){
die($contact_error_subject);
}
if(strlen($message)<3){
die($contact_error_message);
}
if(!isset($contact_email_from)) {
$contact_email_from = "contactform#" . #preg_replace('/^www\./','', $_SERVER['SERVER_NAME']);
}
$headers = 'From: ' . $name . ' <' . $contact_email_from . '>' . PHP_EOL;
$headers .= 'Reply-To: ' . $email . PHP_EOL;
$headers .= 'MIME-Version: 1.0' . PHP_EOL;
$headers .= 'Content-Type: text/html; charset=UTF-8' . PHP_EOL;
$headers .= 'X-Mailer: PHP/' . phpversion();
$message_content = '<strong>' . $name_title . '</strong> ' . $name . '<br>';
$message_content .= '<strong>' . $email_title . '</strong> ' . $email . '<br>';
$message_content .= '<strong>' . $message_title . '</strong> ' . nl2br($message);
$sendemail = mail($contact_email_to, $subject_title . ' ' . $subject, $message_content, $headers);
if( $sendemail ) {
echo 'OK';
} else {
echo 'Could not send mail! Please check your PHP mail configuration.';
}
}
?>

Answer 1

You are doing it correctly on https://github.com/Mendiolac/Portfolio/commit/0ad2fc815523a26f272f91bb192123c4caf41632 , just need to add keys to your .env file