using new functions for recurring payment

Handling Recurring Payments
// Direct with code.

// custom functions :
   debug :: my custom function to print array and objects in a but beautiful way
   
   // new functions in the merchant_paypal_express.php
   
   1.  do_recuring()            // initilize Recurring payment ( createing users recurring profile )
   2.  _build_recurring()       // a private function to build recurring profile parameters
   3.  get_profile_details()    // get the users recurring profile
   
   hint:
        my controller will init with following url
   
    ##  my_base_url/payment_gateway/pay/pay_now/1/paypal