payment gateway

Question

hello friends,

 can any body tell me process of transaction occur in e-commerce wesites and some donation websites .And the money is added to there accounts.

 when the user  select any creditcard or netbanking option in the panel.the page will redirecting to the banking website,and their transactions are made.[this is wt process is done]

 Here i have a doubt:

how and what kind of  links are used to redirect to the banking site.

 

for suppose:i have a button named netbanking. how to provide the " banking site  Link" to the netbanking, creditcard buttons in my wesite. And the money has to be added in my account, when the customer do any payments in my website.

 

please provide step by step procedure

 

thanku