How can one effectively use composer.json to install libraries like Omnipay for PHP projects?

To install libraries like Omnipay for PHP projects, you can use composer.json to specify the dependencies you need. By adding Omnipay to your composer.json file and running `composer install`, Composer will automatically download and install the Omnipay library along with any other required dependencies. ```json { "require": { "omnipay/omnipay": "^3.0" } } ```