I am facing the 400 Bad Request when getting access token. Please help me for the below issue.
Also, I have whitelisted the below IP Address on my Cloudflare Account but still showing the below error.
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.
If you continue to see issues with this, please feel free to contact our team directly via email at firstname.lastname@example.org , referencing case number 31498278.
Within your email, please provide us with the API key that you are using to make the request, the full request(s) where you are receiving the response (including URL, headers, timestamp, and request body), and the full response body so that we can better assist you in identifying the root cause of the issue.
Please have a look and let us know if you have any other questions!