How do you make a working shop gui with spendable items?

I already. Made the shop gui itself. Now i just need. The items to be purchasable.How do i sell a speed coil for 25 cash (my currency) then when bought it goes into the starter pack. And what script will it be local or just a plain script

I already answered this..

https://scriptinghelpers.org/questions/56214/how-to-buy-things-with-your-in-game-currency#55093