How can I set a minimum order (R$ 30,00) to allow my customer to make an order ?

How can I set a minimum order (R$ 30,00) to allow my customer to make an order ?

I have seen some discussions about this but anyone matches with my form.

I do not have a payment option. My form is only to make an order.

https://form.jotformz.com/81047945344662

Thanks

Please do the following:

1) Add a Form Calculation widget to get the total from the payment field, and hide it:

2) Add a Text field to show a warning such as "Minimum order is X amount":

3) Create two conditions, one to hide the submit button if the "Total to pay" is less than R$30:

And the second condition to show the message to let the user know what the minimum amount is:

Result: https://form.jotform.com/81223948851967 

Let us know if you need more help.