title: Sylius V0.17 How to add payment methods
body: <p>I installed Sylius via <code>composer create-project -s dev sylius/sylius-standard acme</code> on my local server to take a closer look at it for a upcoming project. Now I'm stuck at adding payment-methods/ a payment-gateway.</p>
  
  <p>I tried to follow the <a href="http://docs.sylius.org/en/latest/bundles/SyliusOmnipayBundle/installation.html" rel="nofollow">docs</a> and install omnipay-bundle but <code>composer require "sylius/omnipay-bundle"</code> failed with:</p>
  
  <pre><code>  Problem 1
      - Installation request for sylius/omnipay-bundle ^0.9.0 -&gt; satisfiable by sylius/omnipay-bundle[v0.9.0].
      - Conclusion: remove omnipay/omnipay 2.3.2
      - Conclusion: don't install omnipay/omnipay 2.3.2
      - sylius/omnipay-bundle v0.9.0 requires omnipay/omnipay 1.0.* -&gt; satisfiable by omnipay/omnipay[v1.0.0, v1.0.1, v1.0.2, v1.0.3, v1.0.4].
      - Can only install one of: omnipay/omnipay[v1.0.0, 2.3.2].
      - Can only install one of: omnipay/omnipay[v1.0.1, 2.3.2].
      - Can only install one of: omnipay/omnipay[v1.0.2, 2.3.2].
      - Can only install one of: omnipay/omnipay[v1.0.3, 2.3.2].
      - Can only install one of: omnipay/omnipay[v1.0.4, 2.3.2].
      - Installation request for omnipay/omnipay == 2.3.2.0 -&gt; satisfiable by omnipay/omnipay[2.3.2].
  </code></pre>
  
  <p>Adding the bundle to the appkernel.php anyway and/or adding configuration to config.yml (like described in the docs) prevents the Server from starting.</p>
  
  <p>I found this issue: <a href="https://github.com/Sylius/Sylius/issues/4396" rel="nofollow">https://github.com/Sylius/Sylius/issues/4396</a>
  which seems related.</p>
  
  <p>Question: 
  - Should there be some choices other than 'Offline' in 'Payment Methods' in the Admin-Frontend (without adding code to the freshly-pulled sylius)?
  - Is Sylius changing so rapidly that the docs are not matching?
  - Lets assume I want to add '2checkout' (just as exampl) as payment gateway, what would i have to do?</p>
  
  <p>I have the feeling i missed something fundamental with this problem :)
  Thanks for your help in advance!</p>