Hello user011501,
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.
It looks like Thrive Themes uses our V2 API. I see that you were also able to successfully create a V2 key and generate a token, however, it looks like their instructions indicate that rather than generating the token yourself, you’d want to paste the key into their integration and it generates a token for you (about halfway through their instructions):
Connect your Constant Contact account through the API to your Thrive Themes products
https://help.thrivethemes.com/en/articles/4647493-how-to-set-up-and-use-an-api-connection-with-constant-contact
Please have a look and let us know if you have any other questions!
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