How to Import and Retrieve SendGrid Contacts using PHP

The SendGrid API provides an interface for managing contacts, but importing and retrieving contact details in a single request is not currently possible. To overcome this limitation, a PHP tutorial demonstrates how to create a custom service class that simplifies the process of importing contacts and checking their status. The code uses Composer to manage dependencies, stores the SendGrid API key as an environment variable, and provides a simple interface for importing contacts and retrieving their details. The tutorial also includes examples of how to test the application and retrieve the contact information in a readable format.