Payment plugins folder are located at "egbusiness/includes//plugins/payment/". To create a new payment plugin do the following:

• Copy "banking" folder to the new bank's name, for example "hsbc"
• Rename files :
  1. banking.inc.php to hsbc.inc.php
  2. banking.php to hsbc.php
• Open hsbc.inc.php with your favorite text/php editor, and replace "banking" words using text replace (replace all) to "hsbc"
  Example:
  
  add_paysystem_to_list(
  array(
  'paysys_id' => 'hsbc',
  'title' => get_config_value('payment_hsbc_name') != ''?get_config_value('payment_hsbc_name'):'HSBC Bank Transfer',
  'description' => 'HSBC Bank Transfer',
  'public' => 1,
  'enable' => get_config_value('payment_hsbc_enable'))
  );
• Open hsbc.php with your favorite text/php editor, and replace "banking" words using text replace (replace all) to "hsbc"
  Example:
  $db = get_config_values(
  'payment_hsbc_name,
  payment_hsbc_holder,
  payment_hsbc_number,
  payment_hsbc_info,
  payment_hsbc_enable,
  payment_hsbc_fee'
  );
• Open config.inc.php with your favorite text/php editor, and replace "banking" words using text replace (replace all) to "hsbc"
  Example:
  
  $_plugin_fields = array(
  'payment_hsbc_name',
  'payment_hsbc_holder',
  'payment_hsbc_number',
  'payment_hsbc_info',
  'payment_hsbc_enable',
  'payment_hsbc_fee'
  );
• Save all files, then upload to your web server "egbusiness/includes//plugins/payment/hsbc"
• Go to egBusiness Admin Panel -> Configuration -> Payment and enable your new payment method.