How does the payment work

Hi regards to being able to take payments.

 How does that work ?

After you have added a payment field in your form, you need to integrate it with your selected payment vendor to establish a connection.

http://www.jotform.com/help/323-Mastering-Payment-Form-Integrations-with-JotForm

Supposed you have already set-up the payment field in your form — when your respondents submit your form, the details of the payment will be sent to the payment vendor to be processed and transaction details will be sent back to JotForm after to indicate that the payment was processed successfully.