Much to my dismay I have found it is not possible to populate a custom field in a Constant Contact list using the WPForms plugin on my Wordpress ecommerce site and for a Newsletter signup. I want the field to be used to differentiate people who sign up based on their preferences (a radio button field on the form) for "A", "B" or "BOTH". Unfortunately, when creating the form I have created and connected to the list, you present only the default list fields, not the custom field. This is a capability using MailChimp and AWeber ,but of course I would prefer to use Constant Contact for many other reasons. Is there a chance you can make this possible. You can contact me to discuss this issue further. email@example.com or 760-822-7238.