This is a tiny project - a mini app that uses PayPal APIs to refund money according to user input. It will be written by Java, run in Windows server environment. The app asks user about the PayPal transaction details, and logins to PayPal server to make the refund. For security, data must be transmitted in SSL.
The app prompts user on result of the refund, and relevant information. Only single refund transaction is required, no need to carry out parallel or bulk procedures.