Hello user7134891,
Thank you for reaching out to Constant Contact API Developer Support.
Utilizing refresh tokens to refresh the access token and maintain account authorization for your application is an essential part of our Authorization Code and PKCE authorization flows. One option you could use to simplify this process is switching your refresh token type from Rotating Refresh Tokens to Long Lived Refresh Tokens in your application settings. With the Long Lived Refresh Tokens option, your Refresh token will continue to be valid after exchanging it for an access token, so you wouldn’t need to worry about having your application update the refresh token with each refresh token request. This option can be found under the “OAuth2 Settings” in your application settings. Below I’m also including overview documentation for our available OAuth2 authorization flows.
OAuth2 Overview:
https://v3.developer.constantcontact.com/api_guide/auth_overview.html
Please have a look and let us know if you have any other questions!
Regards,
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