Hello PaulY3933,
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.
There is currently no way to bypass the initial Authorization Request screen, which can only be accessed/authorized via a browser window, but you should only need to authorize an account once.
After you complete the OAuth2 server flow for V3, Constant Contact returns an access token and refresh token. You can use access tokens to make requests using the V3 API, and you can use the refresh tokens to obtain new access tokens without any user input. This ensures that you only need to authenticate the account you’ll be connecting to once. After the initial authentication, you’ll just use the refresh token and access token to complete your future requests.
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
While the V3 API’s access tokens automatically expire two hours after their last use and have a maximum lifetime of 24 hours, refresh tokens will not expire unless they have been used and/or a new token set has been generated. However, refresh tokens can only be used once, as generating a new set of tokens causes all previous tokens (access and refresh) to expire.
Once you have your first set of tokens, you’ll want to set both the access token and the refresh token as values for corresponding variables in your application, so that when your program runs through step 5 of the OAuth2.0 Server Flow to get the new set of tokens it can assign new values to both of those variables to maintain an authenticated connection.
V3 API - Refresh the Access Token
https://v3.developer.constantcontact.com/api_guide/server_flow.html#step-5-refresh-the-access-token
You can either have the application refresh the tokens on a timer based on the life of the access token, or you can have each submission check to see if the access token is still active, and then use the refresh token to generate a new set of tokens if not.
How to Make Access Tokens Last Longer
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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