PAYPAL integration and IPN processing
Make a papal Add credits to account option after user logs in to our user portal.
create difrent amount selections like USD:10 , 20 , 50, 100 etc.. to enter the desired amount to be recharged.
create a listener for paypal IPN messages. and process the received IPN message and credit the amount to the users account.
there should be a mechanism to to avoid duplicate processing of already processed IPN messages.
the user portal is recently created. requires some fine tuning and design works.