Thank you for reaching out to Constant Contact API Developer Support. My team is here to assist outside software developers with questions about building into Constant Contact's API.
I’m sorry to hear you’re still having difficulty with the 3rd party WPForms plugin. If that is the preferred plugin that you’d like to use, I’d recommend reaching out to their support team for further assistance as they are the company that developed/supports that plugin:
WPForms Support
https://wpforms.com/account/support/
We also offer a WordPress Plugin developed and directly supported by Constant Contact. I’ll include the information and instructions below:
Install the Constant Contact Forms Plugin for WordPress to Gather Sign-Ups and Feedback
http://knowledgebase.constantcontact.com/articles/KnowledgeBase/10054-WordPress-Integration-with-Constant-Contact
Create a contact sign-up form with the Constant Contact Forms for WordPress plugin
https://knowledgebase.constantcontact.com/articles/KnowledgeBase/18059-Create-a-Wordpress-Form
Add a Form Created with the Constant Contact Plugin to a WordPress Page or Blog Post
https://knowledgebase.constantcontact.com/articles/KnowledgeBase/30850-Add-a-Form-Created-with-the-Constant-Contact-Plugin-to-a-WordPress-Page-or-Blog-Post
If you need assistance installing our supported plugin, we have specialists that can assist with the installation process. You can reach them via phone by calling our support line at 866-289-2101 and asking for assistance with our WordPress Plugin.
Please have a look and let us know if you have any other questions!
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