% param_prefix = "payment_source[#{payment_method.id}]" %>
<%= text_field_tag "#{param_prefix}[name]", "#{@order.bill_address_firstname} #{@order.bill_address_lastname}", { id: "name_on_card_#{payment_method.id}", class: 'spree-flat-input', placeholder: Spree.t(:name_on_card)} %>