Hello EmmaH41,
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/connect an account once.
After you complete the OAuth2 Authorization Code 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 OAuth2 Authorization Code Flow
https://v3.developer.constantcontact.com/api_guide/server_flow.html
V3 OAuth2 Tokens Overview
https://developer.constantcontact.com/api_guide/auth_overview.html#get-the-access-token
Please have a look and let us know if you have any other questions!
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