How to make a button with adjustable price?

Question

Unity

How to make a button with adjustable price?
I found instructions on how to shop at a fixed price store like this

100 gold - 1$
500 gold - 3$
1000 gold - 5$

But my picture is built differently, there are several products and the user chooses how much to take, and the button with the total price is already lit at the bottom, how to do this?

Answer 1

If we talk about Google Play,
then there are only fixed prices.
You can create packs
roughly
1$
package 2$
package 3$ package
and depending on how much the user chooses to change the price (package)