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Could you please give us a bit more details about what you are trying to do?
I presume that you would like to:
1. display coupon code if the price is over certain amount
2. accept coupon codes on your payment processing tool
3. automatically apply coupon code if over a certain amount
Do let us know if any of the above is true and if so which one.
Also, I presume that this is the jotform where you would like to apply this: http://www.jotformeu.com/form/50542476739362?