facebook share discount

Hi Guys, could someone point me in the right direction:
I want to add a discount generated upon share on Facebook to my subscriptions, what would be the way to achieve that? Is there a plugin or a work around in Membership pro for that?
Basically if a person shares my project to Facebook I would like to give them a discount for that for the subscriptions I sell on my site.

Any suggestions are welcome.
Thanks

Sorry George. I don't have any clue how to implement this option. I think you will need to check to see who shared your plan on facebook and then give them a coupon code to that they will receive discount during the subscription

I think that's the only way for now

Tuan

I see, thank you for the answer