We need someone to design an extension for a Joomla website which enables registered users to send transaction documents to one another. Information about each transaction (eg date, reference, details, qty, price, etc) will either be manually entered or uploaded via csv or similar.
The recipient will be notified by email (which can be customised) containing some or all of the information of the transaction and they will be able to log in to the site and see the details again, along with previous transactions.
Some transaction documents may require payment, therefore the ability to integrate payment gateway should also be available.