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This issue has not been resolved. This is an extremely frustrating problem. We cannot send our campaign without a resolution.  ... View more

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.   In your application, you should only need to store the most recent set of tokens, but you will need to request a new set of tokens each time the previous access token has expired. It is not necessary to store old tokens that have already been used.   Access tokens automatically expire two hours after their last use, with a maximum lifetime of twenty-four hours, while the refresh token only expires once used, or if a new refresh token is generated. When you’re running your application, you’ll need to check if the access token has expired, and if so, use the refresh token to generate a new set of tokens, but you should only need to store the most recent set of tokens.   V3 API OAuth2.0 Server Flow https://v3.developer.constantcontact.com/api_guide/server_flow.html Tokens Overview https://developer.constantcontact.com/api_guide/auth_overview.html#tokens   How to Make Access Tokens Last Longer https://developer.constantcontact.com/api_guide/faqs_manage_applications.html ... View more

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.   The POST /contacts/sign_up_form endpoint is the one you would want to use to add a new contact to an account or update an existing contact based on their email address.    If the email address you provide already belongs to an existing contact, POST /contacts/sign_up_form updates that contact instead of returning a 409 Conflict error. This allows you to add contacts to an account without having to make a separate API call to check if the email address already exists for a contact in the user account. https://v3.developer.constantcontact.com/api_guide/contacts_create_or_update.html ... View more

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.   You should only need to refresh the token when it expires, rather than every time you send a request. https://developer.constantcontact.com/api_guide/auth_overview.html#tokens   You may still run into a 429 error if too many people submit the form at the exact same time, but in that case you should be able to retry the failed request using the same token. https://developer.constantcontact.com/api_guide/rate_limits.html ... View more