composer install issue

[chrisvidal]

What does this mean?

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

  Problem 1
    - The requested package dioscouri/omnipay-cybersource ~3.0 is satisfiable by dioscouri/omnipay-cybersource[3.0.x-dev] but these conflict with your requirements or minimum-stability.

[MGatner]

The documentation is incorrect. The version of Omnipay it satisfies is 3.0 but this package only has a single release: 1.0.0. Use the following instead:

{
    "require": {
        "dioscouri/omnipay-cybersource": "^1.0"
    }
}

Or better yet, from the command line just write composer require dioscouri/omnipay-cybersource.