Hello RandyN72,
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.
Regarding developer accounts, please see my other reply on this post: https://community.constantcontact.com/t5/API-Developer-Support/Looking-for-sandbox-account/m-p/395747/highlight/true#M13826
As far as generating API keys, you can do this either within your existing account, or within a developer account:
In the developer side of the website, keys can only be accessed by the user that generated them, and are not universal to the account. When they are generated, they do not have any access or privileges to any account, including the one that generated them. Access is only granted via the OAuth2 authorization process.
V3 OAuth2 Overview
https://v3.developer.constantcontact.com/api_guide/auth_overview.html
You can find the steps to create a new V3 API key/application by clicking to expand the section “How do I Get an API Key?” at this link:
https://developer.constantcontact.com/api_guide/faqs_manage_applications.html
Please have a look and let us know if you have any other questions!
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