how the customer pays the correct cost amount from the form.

Also, I'm trying to figure out how the customer pays the correct cost amount from the form.

I'm not sure which of the two forms are you referring to but as I checked, both forms have a dropdown field where the user can choose a package.

There are two ways on how to achieve this requirement.

1. Using the PayPal integration itself, you can add multiple products and assign values to each product. For this one, having a dropdown field for packages is no longer necessary. Here's an example:

2. Use the dropdown and form calculation fields to define and calculate values then pass that value to the payment field. You may refer to this guide on How-to-Pass-a-Calculation-to-a-Payment-Field

I would recommend using the first method if there will be no complex calculations to make.

Please try these and let us know how it goes.