Postfinance adapter for omnipay

Omnipay Postfinance integration for https://www.postfinance.ch/en/

Implementation

Add this repository to composer.json

{
    "name": "mono/v5",
    "repositories": [
        {
            "type": "vcs",
            "url": "https://github.com/monosolutions/omnipay-postfinance"
        }
     ],
     "required": {
        "mono/omnipay-postfinance": "dev-master"
     }
}