So you want the user to pay you! There are of course many ways to do this, but we're going to work with PayPal here as it is very commonly used. A similar approach will often work with other payment gateways.
Note
ChronoForms has two payment gateway plug-ins included in the package (for Authorise.net and for the PayPal WebPayments Pro API). Both of these work for testing purposes, except that they randomise the amounts unless you pay a small license fee.
Nothing special is required for the recipe, though it won't be of much use unless you have an active PayPal account. The basic account will work with this recipe; you don't need the advanced API that the ChronoForms PayPal plug-in requires.
1. Any purchase form will do, we're going to be working in the back end for most of the time.
2. We'll start by looking at the code for a PayPal Buy Now button. Here's the code from an example at https://www.paypal.com...