How can the Sendgrid class be downloaded and included in a PHP project?

To include the Sendgrid class in a PHP project, you can use Composer to download the Sendgrid library. First, create a `composer.json` file in your project directory and add the following code: ```json { "require": { "sendgrid/sendgrid": "^7.0" } } ``` Then run `composer install` in the terminal to download the Sendgrid library. Finally, include the Sendgrid class in your PHP file using `require_once` or Composer's autoloader. 

require 'vendor/autoload.php';

$sendgrid = new \SendGrid('YOUR_SENDGRID_API_KEY');

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Sendgrid PHP class download include

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