Hello @user942713,
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.
When it comes to Access Tokens they do expire/overwrite after a certain amount of time or when a user generates a new Access Token depending on which API version they're using. This was implemented as a security measure, if you need multiple Access Tokens on an account for our V2 API the only workaround at this time would be to have multiple users on the account that way they can all have a separate Access Tokens. Our V3 API on the other hand does not offer static Access Tokens as they expire every 2 hours. Just in case, below are links to documentation on Access Tokens for both our V3 and V2 APIs.
V3 API (Expires) https://v3.developer.constantcontact.com/api_guide/client_flow.html#step-3-retrieve-the-access-token
V2 API (Overwrites) https://v2.developer.constantcontact.com/docs/authentication/authentication.html
Please reply directly to this post if you have any other questions!
Regards,
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