SCRIPT FOR WEBSITE WANTED. CAN USE LARAVEL OR JAVASCRIPT OR PHP AS IS APPLICABLE

I need a script that for operating a 'share to get a reward' system for websites. Each user sees a custom link, and next to it there are SHARE buttons , which if clicked takes him to places such as facebook, twitter etc and he shares the link. If x number of people click on the link, then, 'the reward becomes visible in the vicinity. He can copy and paste that custom link into messenger or facebook or wherever. Or he can click share , and the custom link with instructions gets posted to facebook or where that share button points. example: REWARD SYSTEM 1 let us say that as reward we want to give away serial numbers to the software. we need a system whereby we can load up 40 serials, and each time some user opens shares HIS unique link and reaches the 'REWARD THRESHOLD' one of these serials is given to him. And needless to say, each serial is given to only one person, after which that serial is deleted from the 'rewards box'. When all serials are used up, (ie all serials have been given away) ,instead of showing a shareable link it should just say 'Sorry, This Promotion is Over.' REWARD SYSTEM 2, where the 'reward' is a x% off discount code, this can keep popping up until a designated expiration date after which it will show same sorry message. This will be as a free service to website owners who can sign up, enter their info and get the code to install on their website. (this will be the admin panel for website owners. There will be the master admin panel for the service owner, who will be able to add two custom ad buttons to the 'share' banner, for example let us say you want to advertise pepsi, you would see a pepsi icon next to the share buttons, which on click will take the user to [login to view URL] lol. (please see attached image)