Implements iPizza protocol to communicate with Estonian Banks.

Usage
=====

Add gem dependency in your `Gemfile` and install the gem:

    gem 'ipizza', :git => 'git://github.com/priithaamer/ipizza.git'

Configuration
=============

Configuration can be made in two different ways, using `Ipizza::Config.configure` block or loading configuration properties from YAML file.

Loading from YAML file:

    Ipizza::Config.load_from_file('config.yml')

Configuration values should be set in YAML file in **provider.attribute_value** format. See example YAML file below in "Configuration parameters" section.

At any time, configuration can be modified with `Ipizza::Config.configure` block:

    Ipizza::Config.configure do |c|
      c.swedbank_service_url = 'http://foo.bar/swedbank'
    end

Configuration parameters
------------------------

    swedbank:
      service_url: http://foo.bar/swedbank
      return_url: http://mycompany.com/store
      cancel_url: http://mycompany.com/cancel
      
      # Your private key file path. Can be specified relatively
      # to YAML file
      file_key: ./certificates/my_private.key
      
      # If your private key is protected with password,
      # provide it here
      key_secret: private_key_password
      
      # Path to bank's public key file. Can be specified
      # relatively to YAML file
      file_cert: ./certificates/bank_public.crt
      snd_id: dealer
      encoding: UTF-8

Payment requests
----------------

### Building request

    payment = Ipizza::Payment.new(
      :stamp => 1, :amount => '123.34', :refnum => 1,
      :message => 'Payment message', :currency => 'EUR'
    )
    request = Ipizza::Provider::Swedbank.new.payment_request(@payment)

Authentication requests
-----------------------

### Building request

    request = Ipizza::Provider::Swedbank.new.authentication_request

### Validating response

    response = Ipizza::Provider::Swedbank.new.authentication_response({'VK_PARAM_1' => 'VALUE 1', ...})
    response.valid?

Gateway specifications
======================

This library currently works with four Estonian Banks. Here are their respective interface specifications:

* [Swedbank](https://www.swedbank.ee/static/pdf/business/d2d/paymentcollection/info_banklink_techspec_est.pdf)
* [SEB](http://www.seb.ee/index/130212050201)
* [Sampo](http://www.sampopank.ee/et/14732.html)
* [Nordea](http://www.nordea.ee/Teenused+ärikliendile/E-lahendused/787802.html)

Helpful links
=============

* [Repository](http://github.com/priithaamer/ipizza)
* [Issue tracker](http://github.com/priithaamer/ipizza/issues)

Todo
====

* Raise reasonable exception during configuration when certificates or keys cannot be loaded
* Write ipizza-rails module:
  * Proper Rails initialization
  * Write Rails controller and model generator
  * Rails helper to generate iPizza request forms

Authors
=======

* Priit Haamer
* Tarmo Talu (Thanks for the 7-3-1 algorithm)