app/views/paymill_on_rails/subscriptions/_form.html.erb
<%= form_for(@subscription) do |f| %>
<% if @subscription.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(@subscription.errors.count, "error") %> prohibited this subscription from being saved:</h2>
<ul>
<% @subscription.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="actions">
<%= f.submit %>
</div>
<% end %>