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.
According to the support documentation for the Kindful integration:
“Tags in Constant Contact will not sync with Kindful. These Tags will just live in Constant Contact.”
https://support.kindful.com/hc/en-us/articles/115011059447-Connecting-Constant-Contact
While Constant Contact’s V3 API does offer an endpoint for tags, based on the resource linked above, the integration developed by Kindful may not include that endpoint in their design. However, because this integration was developed by Kindful and not by Constant Contact, you’d need to contact Kindful directly for questions about their integration and how it connects to Constant Contact.
Support for Kindful can be found here:
https://support.kindful.com/hc/en-us/requests/new
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