Hello Garrett,
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.
Unfortunately, the Custom Sign up form Generator tool mentioned in the previous post is no longer available. However, we do offer a redirect option with our Lead Generation Landing Pages which would allow you to include a redirect URL that includes tracking for Google Analytics.
Create a Lead Generation Landing Page for capturing new sign-ups https://knowledgebase.constantcontact.com/articles/KnowledgeBase/32012-Create-a-Lead-Generation-Landing-Page-for-Capturing-New-Sign-Ups-to-Your-Contact-List
Alternatively, if you wanted to develop your own form and have the analytics built in directly, you could build a form using our V3 API endpoints and then incorporate the needed tracking directly into the page containing the form.
Getting Started with Constant Contact’s V3 API https://v3.developer.constantcontact.com/api_guide/getting_started.html
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