Merge service libraries into one repository and use git tree split

[makasim]

IMO it starts to be annoying that every payment has own repository & is not any way to get all of them in one time, also most of those implementation are really similar when you compare code bases...

What I'm suggesting is a merge into main repo all of those (could be hard to maintain at some point), or create new repository, i.e. PayumGateway (or something) and merge all those currently separated repositories (AuthorizeNetAim, Be2Bill etc.).

With this approch you could have in main catalog an composer.json file:

{
    "name": "payum/gateways",
    "type": "library",
    "license": "MIT",
    "require": {
        "php": ">=5.3.2",
        "payum/payum": "0.7.x-dev",
    },
    "autoload": {
        "psr-0": { "Payum\\Gateway\\": "src/" }
    }
}

All gateways would be store i.e. Payum\Gateway\Be2Bill, and on that folder it will be same as actual content of repository with git tree split.

The approach is same as used by Symfony or Sylius.