Job Description: We are looking for an experienced WordPress developer who can integrate our website’s lead forms with Constant Contact using their API. We have a custom post type called "Trips", and on each Trip page, we display a WPForms lead form. We need a solution where, when a user submits this form, the lead data will be automatically sent to Constant Contact — organized by Trip. Project Requirements: Custom Post Type: Our website has a custom post type called "trips". Each Trip page has a unique title and its own WPForm for lead collection. Form Integration: The Trip page’s WPForm is already connected to Constant Contact for basic lead collection. We now want custom API integration for more dynamic lead organization. Constant Contact API Functionality: When a user submits a form on a Trip page, your code should: Create (or check for) a new folder/list in Constant Contact named after that Trip title. Add the lead (name, email, phone, etc.) from the form submission into that Trip’s folder/list. Technical Requirements: Use the Constant Contact API (v3) for all operations. Ensure the process handles existing folders gracefully (no duplicates). Follow best practices for authentication, error handling, and performance. Clean, well-documented code that can be easily maintained.