TransactionDetails:

• Uses the transaction ID for a particular payment to return the transaction details. As a result, the information associated with a transaction can be obtained at the time of the payment or at a later time.

TransactionSearch:

• Searches across a range of transactions for certain criteria and returns a response. For example, find transactions based on date range, payment status, or information about the buyer for further research or for particular actions, like refunds.

RefundTransaction:

• Automates the refund process by accepting all parameters for a refund and performing the refund. With Refund API, allow your customer service representatives to process PayPal refunds the same way as they process credit card refunds.