Hello trytte,
unfortunately, a fool-proof solution for this is not possible. You can not control how often the user will click the button to increase the value or click the button to decrase the value. With this technique, there will not be an auditable history of who clicked which button when and how often.
The code for the button would go somewhere along the lines of
Increase value button:
and for the decrease button
I don't advise to use that kind of code, because there is no audit trail or history.
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