What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
You will not be able to do it directly using the Purchase Order tool.
Instead use Calculation field so that you can assign conditional statement that can validate the current Total amount.
Check this user guide http://www.jotform.com/help/275-How-to-pass-a-calculation-to-a-payment-field
Here is a demo form you can check http://form.jotform.me/form/42522161797457?
In the test form, if the Total Amount is less than 15.00 , you will not be able to submit the form.
Hope this help. Inform us if you need further assistance.
Right…. I understand, but if I do it that way, that means I cannot add a payment tool to the form.. correct
No, it's not correct. We now have a way to collect an actual payment while configuring your product items using Radio, Dropdown or Checkbox fields.
You can add a payment tool and forward the total amount using the calculation widget. We have a guide for that:
Let us know if you need further assistance.