Limit tickets sold via Jotform

Is there a way to prevent sales above 56 on our form? 

Hi,

It is definitely doable. Please use "Inventory Widget" in order to make it work. You can create your product on the widget and limit its number to 56. You can then use "Form Calculation" widget to calculate the total price and make it pass to the payment field. 

Please see an exemplary video here: http://www.screencast.com/t/wvBMKrTNZKCy

This guide of our should also be helpful: https://www.jotform.com/help/275-How-to-Pass-a-Calculation-to-a-Payment-Field

Please check these and let us know if you encounter any issues. 

Thank you for contacting us.