script that when user registerd into wordpress he get to insert code for his onl

hello, i want to create a script that when user registerd into wordpress he get to insert and use a script code that i wrore, and i want it to be this user and his site only, and if another wanr to use it he needs to buy and vice versa, how would u recommand to do that?

Write a plugin. Register it with WordPress.org. The end.

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