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The process for obtaining the OAuth2 code parameter for redirection purposes after logging in using the OAuth2 authentication code flow is as follows:

1. The user initiates the OAuth2 authentication code flow by clicking on a login button on the client application.

2. The client application redirects the user to the authorization server's authorization endpoint, passing along the client ID, redirect URI, and scope as query parameters.

3. The authorization server prompts the user to log in and authorize the client application's requested scopes.

4. Once the user has authenticated and authorized the scopes, the authorization server redirects the user to the client application's redirect URI, passing along an authorization code as a query parameter.

5. The client application then makes a POST request to the authorization server's token endpoint, passing along the authorization code, client ID, client secret, and redirect URI as parameters.

6. The authorization server verifies the client ID and secret, and exchanges the authorization code for an access token and refresh token.

7. The authorization server returns the access token and refresh token to the client application in the response body.

8. The client application can then use the access token to make requests to protected resources on behalf of the user.

Overall, the process involves redirecting the user to the authorization server to authenticate and authorize the application's requested scopes, and then exchanging the resultant authorization code for an access token at the token endpoint.