Installing AIM API with composer

[DeftBird1]

I receive the following when running: "/opt/php55/bin/php composer.phar require authorizenet/authorizenet"

Your requirements could not be resolved to an installable set of packages.

Problem 1 - The requested package authorizenet/authorizenet No version set (parsed as 1.0.0) is satisfiable by authorizenet/authorizenet[No version set (parsed as 1.0.0)] but these conflict with your requirements or minimum-stability.

Installation failed, reverting ./composer.json to its original content.

Composer.json contents:

"name": "authorizenet/authorizenet",

"type": "library",

"description": "Official PHP SDK for Authorize.Net",

"keywords": ["authorizenet", "authorize.net", "payment", "ecommerce"],

"license": "proprietary",

"homepage": "http://developer.authorize.net",

"require": {

"php": "~5.3 || ~7.0",

"ext-curl": "*",

"ext-json": "*",

"ext-simplexml": "*",

"ext-xmlwriter": "*",

"goetas-webservices/xsd2php-runtime":"^0.2",

"goetas-webservices/xsd-reader": "^0.1",

"authorizenet/authorizenet": "~1.8",

"jms/serializer": "serializer-master-dev as 1.0"

},

"require-dev": {

"phpunit/phpunit": "~4.0",

"phpmd/phpmd": "~2.0"

},

"autoload": {

"classmap": ["lib"]

},

"autoload-dev": {

"classmap": ["tests"]

},

"repositories": [{

"type": "vcs",

"url": "https://github.com/goetas/serializer.git"

}]

}

Any help would be appreciated, as this has not been the smoothest of processes.

[DeftBird1]

using "sdk-php-1.8.9" if it matters

[DeftBird1]

In case anyone has the same problem, the composer.json file is way outdated when you download the latest sdk from https://github.com/AuthorizeNet/sdk-php/releases.  I downloaded the .zip file

AuthorizeNet/sdk-php: PHP SDK for Authorize.Net API

{
  "require": {
  "php": ">=5.5",
  "ext-curl": "*",
  "authorizenet/authorizenet": "1.8.9",
  "jms/serializer": "serializer-master-dev as 1.0"
  },
  "repositories": [{
       "type": "vcs",
       "url": "https://github.com/goetas/serializer.git"
  }]
}