Thank you for reaching out to Constant Contact API Developer Support.
There is currently no way to bypass the initial Authorization Request screen and redirect, which can only be accessed/authorized via a browser window, but you should only need to authorize an account once.
However, with the recent update to our new authorization management service, we did recently release the capability to generate V3 keys that offer a Long Lived Refresh Token (which can be configured within your key’s settings), where you can use the same refresh token continuously to generate new Access Tokens.
Update Your Applications to Use the New Authorization Service
While we generally recommend using rotating refresh tokens (as they're more secure), using a long lived refresh token should alleviate many of the situations that we've seen reported where a refresh token becomes invalid, and then requires a new authorization request.
Currently, the Long Lived Refresh Tokens are only compatible with our OAuth2 Authorization Code Flow, and must be used at least once every 180 days in order to remain valid.
OAuth2 Authorization Code Flow
Please have a look and let us know if you have any other questions!
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