What's the easy way to integrate a payment method into my form?

Trying to figure out the easiest way to integrate a payment method into the form.  I want it to work with the total from the order.  I haven't decided on which method yet but I'm thinking PayPal or Square.

Currently your form has a PayPal field.  Here is information on how to set up the PayPal integration:

https://www.jotform.com/help/50-PayPal-Forms

It is quite easy with regular PayPal as it only requires entering your PayPal account email address. 

If you would like to use Square instead, delete the PayPal field and add a Square field:

https://www.jotform.com/help/459-How-to-Integrate-Form-with-Square

Your products will carry over to the new field.