Roblox made an update where you can trade in robux for in game money. So, I wanted to do something original, trade in robux for a random amount of in game money, how do I do that?
First of all, you will need to go to your games settings on ROBLOX. Find where the Dev Products are (Developer Products). You will need to create one. THEN after you have created one, you will need to make a script in Edit mode (of your game) on Studio so when the players buy the Product, they get the money or cash or Robux or points you want them to have. That is all good if you have something to ask if they player wants to buy it eg. A part of a GUI where they can click onto or touch which then gives them a prompt if they want to buy.
You can code this put by looking on roblox wiki for scripting and also Developer products
I hope this helped you even if it was a little bit. Please thumbs up or select as a good answer :) Good luck, and may the force be with you.