How can I change the Dynamic Textbox widget as an email field?

I would like to know how I can change the dynamic text box as an email so that I can use that field for customer email field in Gateway Payment setting?

Unfortunately, it's not possible. But there's a workaround by adding a new email field and adding conditional logic to copy the entries from the Dynamix Textbox widget into the new email field. The only downside of this is that the emails will be copied without a comma, they'll be piled into a single line.

Here's a clone version of your form showing this workaround: https://www.jotform.com/80165173516959.

Here's the conditional logic:

Your question about the Credit Card field has been moved into a new thread. Here's the new link https://www.jotform.com/answers/1352467.