composer.json

{
  "require" : {
    "braintree/braintree_php" : "3.31.0",
    "php": ">=5.2.1",
    "slim/slim": "^2.6",
    "vlucas/phpdotenv": "^2.1"
  },
  "require-dev": {
    "phpunit/phpunit": "5.*"
  }
}