app/views/spree/checkout/payment/_ideal.html.erb
<p data-hook="sisow_ideal"></p>
<fieldset id="sisow_payment__<%= payment_method.id %>" data-hook>
<legend><%= Spree.t(:bank_selection) %></legend>
<%= select_tag "issuer_id", options_from_collection_for_select(Spree::PaymentMethod::SisowBilling::Ideal.issuer_list, "id", "name") %>
</fieldset>