Hello ezaske,
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.
As Power Automate / Microsoft Flow is a 3rd party product and not built or supported by Constant Contact, we are limited in the support we can provide, but will try to answer any questions to the best of our ability as they pertain to Constant Contact’s API endpoints and functionality.
From what we understand, the issue that many users run into regarding using Power Automate with Constant Contact's V3 API is how to refresh the token set (access token and refresh token), as our access tokens only have a lifespan of 24 hrs.
I was able to find some related 3rd party resources below that may offer some additional insight on possible resolutions if needed, but if you need further assistance with setting up an Oauth2 authentication within Power Automate / Microsoft Flow, you’d want to reach out to Microsoft's support team directly for assistance:
[3rd party link] https://powerusers.microsoft.com/t5/Building-Flows/OAuth-2-how-to-re-authenticate-refresh-an-expired-token/td-p/413261
[3rd party link]
https://stackoverflow.com/questions/67811804/capturing-user-authentication-and-refresh-tokens-power-automate
As far as setting up a daily sync, the V3 OAuth2 Authorization Code Flow will likely be the best option:
V3 API - OAuth2 Authorization Code Flow
https://v3.developer.constantcontact.com/api_guide/server_flow.html
While our expertise is with our API itself as opposed to its implementation within any particular programming language and Constant Contact doesn’t offer any services as far as assisting with building custom integrations, we are happy to answer any questions pertaining to Constant Contact’s API endpoints, functionality, and documentation.
If you'd like, we're happy to provide more detailed steps regarding the authorization process, endpoint calls, and call schemas, to request this, please feel free to email our team directly at webservices@constantcontact.com and reference case # 31127905.
Please have a look and let us know if you have any other questions!
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