Hello Rita,
My name is Caleb and I am a member of Constant Contact's API Developer Support team.
Please note that Contact Form 7 is a 3rd party product and not built or supported by Constant Contact, so we are limited in the support we can provide, but will try to answer any questions to the best of our ability as they pertain to Constant Contact’s API endpoints and functionality. Constant Contact makes these endpoints available for 3rd party developers to create integrations with our system.
After reviewing the API Key associated with the Contact Form 7 sign up form utilized on your site we have found that the plugin is using an outdated version of our API. More specifically, the version of the Contact Form 7 plugin that you are using is making calls to our soon to be deprecated V1 API.
To resolve this issue we recommend that you upgrade the current form and plugin to the newer version of the Contact Form 7 plugin which utilizes our current V3 API.
Contact Form 7:
https://wordpress.org/plugins/contact-form-7/
Generate a V3 API Key and Secret:
https://developer.constantcontact.com/api_guide/faqs_manage_applications.html
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