Example composer.json with satis repo and packagist disabled.

composer.json

{
    "repositories": [
        {
            "type": "composer",
            "url": "https://s3.amazonaws.com/my_satis_repo/"
        },
        {
            "packagist": false
        }
    ],
    "require": {
        "phpunit/phpunit":"3.7.28",

    },
    "config": {
        "bin-dir": "bin/",
        "notify-on-install": false
    },
    "autoload": {
        "psr-0": { "": "src/" }
    }
}