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.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
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 should fill this text box when you want to charge your customer a higher quantity than the regular payment, for example, if you want to charge $50 additional and the regular price is $100 then this text box should be filled with $150, the $50 will be charged as a fee for the setup of the subscription.
If you will not charge your customer an additional fee to the regular price then you should not change this value.
You will find the details about this and how to set up recurring payments on this guide: https://www.jotform.com/help/166-How-to-setup-a-recurring-payment-option.
Hope this helps.