PayPal Pro Widget Issue

We are using the PayPal Pro widget but found a problem. If a person chooses/checks a product, and leaves the quantity at 0, the form still goes through the submit process, because truly the field is filled out and is required. Is there a way to make sure that when one of the products is checked to ensure there is a quantity greater than 0?

It is necessary that you add "1" as default quantity value. You can do so by selecting Paypal properties > quantity > edit:

You can test and clone the demo form:  

https://form.jotform.com/60844753007960 

Let us know if we can assist you further.