spree_paypal_express/app/views/spree/admin/paypal_payments/refund.html.erb

<%= render :partial => 'spree/admin/shared/order_tabs', :locals => {:current => "Payments"} %>

<% form_tag do %>

  <h3><%= t('refund') %></h3>
  <fieldset>
    <p>
      <label for="amount"><%= t("amount") %></label>
      <%= text_field_tag :amount, @paypal_payment.amount %>
    </p>
    <p class="form-buttons">
      <%= button t("make_refund") %>
    </p>
  </fieldset>
<% end %>