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I see on your screenshot that you did not get the total order, however it should be present.
I made a quick test and was able to get it:
As per the following guide: http://www.jotform.com/help/233-How-To-Add-Coupon-Code-in-the-Payment-Form
However please do note that as per the guide above, that is only available to PayPal standard, not PayPal Pro which you are using.