This extension will add a field for entering important information about payment method and display it on the checkout page (personaly, under each methods).
For work this add-on correctly you should have installed module Vqmod.

At your request, added compatibility with the module "Pasarela de pago Servired"
http://www.opencart.com/index.php?route=extension/extension/info&extension_id=928

At your request, added compatibility with the module "1-9 Variable Payment Methods (cash, invoice, etc.)"
http://www.opencart.com/index.php?route=extension/extension/info&extension_id=2091

At your request, added compatibility with the template "Sellegance"
http://themeforest.net/item/sellegance-responsive-and-clean-opencart-theme/1285060

The archive is a file with English and Russian. if you want to translate into your language, please read the documentation.