How make license key system for webSite and use it on appliction

how can i make license key system and automatic work when some one buy product
and i’m use WordPress and cPanel and Plesk……
Can Some one help me do this?
and i need it to one time use!
and its be like companyes , and send an emile for user when he finshes his order.
using php and vb.net because i will use it to virfy him on the appliction!
and i wont it to be uneasy to crack.
and online server check.
i have ubuntu server and database i can use one of theis for license key SYSTEM
and contains expire date, vaild date, Name of buyer.

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