Additional filters for `GET#Refunds` endpoint

Changes implemented:

We've enhanced our Refunds API endpoint to allow you to organize your refund transaction records more efficiently. Now, you can sort these records in either an increasing (oldest first) or decreasing (newest first) sequence based on two key dates: the date the record was initially created (created_at) and the date it was last updated (updated_at). This new feature is designed to help you find and review your refund transactions more easily, by showing you the most recent or the oldest entries according to your preference.

More information: