manychat/manychat-api-php ? reverse-engineered prompt

Build me a small PHP library that makes it easy to call the ManyChat API from a normal project. I want to be able to create an API client with a ManyChat token, or use it in a simple singleton style, then access the main ManyChat areas like page info, sending messages, and subscriber actions through clean PHP objects.

Please make the library easy to install with Composer, and include a few straightforward examples in the README showing how to initialize it and call a basic method. Keep the code organized and readable, and make sure it feels like a real reusable package I could drop into another PHP app. If you need to check the current ManyChat API docs for method names or behavior, go ahead and look them up online.