Virtuemart purchase transer system between users

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
I have a joomla e-shop with virtuemart. I need modification to virtuemart so my customers will be able to transfer their purchases to each other with a fee to my e-shop.
e.g.: I am a customer and i have purchased a lisence from the website and I can see it on my order list. Now i want to transfer it to another e-shop customer using his id. I will not get any money for this transaction but i need to pay a fee to the e-shop.

Skills required:
PHP, Software Architecture
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