Hello Debbie,
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.
Based on the documentation for Gravity Forms, it looks like they have you copy a Redirect URI from gravity forms into your API key settings in Constant Contact, so you might want to double check those values by repeating the steps.
Setting Up the Gravity Forms Constant Contact Add-On
https://docs.gravityforms.com/constant-contact-add-on/
If you need help configuring the integration further after trying these steps, I’d recommend reaching out to Gravity Forms directly:
Support » Plugin: Gravity Forms Constant Contact
https://wordpress.org/support/plugin/gravity-forms-constant-contact/
Please note that Gravity Forms 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.
Please have a look and let us know if you have any other questions!
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